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4. Citing Sources in Scientific Writing

Objectives:

Students will know:

  • when quotation marks and in-text citations are needed in a scientific work.
  • how partial quotations should be documented in written works
  • how often an author must include an in-text citation.

 

 

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Objective 1.  Students will know when quotation marks and in-text citations are needed in a scientific work.

When writing your monograph, you MUST cite the sources of the information that you summarize.

Paraphrased information from a resource or a group of resources is not enclosed in quotes, but still must be followed by an in-text citation that includes all sources from which the information was derived.   

Word-for-word information from a source must be enclosed in quotes and must be followed by or include a citation referring to the source.

enclose in quotes? in-text citation/s needed?
paraphrase no yes
word-for-word yes yes

 

 

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Objective 2.  Students will know how partial quotations should be documented in written works

 

….   Three dots  can be used to indicate that you’ve skipped some of the quotee’s words

[ ]   Square brackets can be used to enclose words that you insert in the middle of the quotee’s words

 

For example, a student might slightly change the sentence by Philips as shown below:

Philips:

We believe chemoprophylaxis may well reduce future morbidity from TB in high risk groups by some 50 to 75 percent.

student monograph:

Philips et al. believe that “chemoprophylaxis … [could] reduce future morbidity from TB in high risk groups by … 50 to 75 percent.”1

In the example above, a superscript 1 is the in-text citation.  This number indicates that the source information is in the first entry in the bibliography.   Superscript numbers are used for in-text citations in the “AMA 11th edition” citation style that you will use for your monograph assignment and by many other citation styles.  In most citation styles that use numbers for the in-text citations, the first citation in the text will be given the number 1.  

 

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Objective 3.  The student will know how often an author must include an in-text citation.

 

Rules of thumb  —  as many citations as are needed to indicate changes of source, at least one in-text citation at the end of the final sentence in each paragraph that is based on the information from others.

Some students include in-text citations at the end of every sentence.  This is not incorrect.  However, it’s not always necessary.   The reader must be able to tell which source/s served as the basis for each sentence.  However, if a section of a paragraph are drawn from one source or the same group of sources the author can use a single in-text citation at the end of the section.

In almost all cases (an exception is mentioned later in this chapter), you must include an in-text citation at the end of a paragraph.  Remember, most readers do not read an article in its entirety. You don’t want to frustrate your reader (you especially don’t want to frustrate your paper’s reviewers/graders).  On the whole, readers should be able to easily find the a citation within each paragraph  or within each row of a table.  Typically, an in-text citation is placed at the end of a section of the text (within a paragraph) that has been drawn from a source or group of sources.  If a sentence doesn’t contain an in-text citation, the reader is expected to look for the next in-text citation in the paragraph (not the preceding in-text citation).  Thus, the final sentence in a paragraph should always contain or be followed by an in-text citation.

Example:

A paragraph from a journal article is shown below.  (from  Schuetz P, Chiappa V, Briel M, Greenwald JL. Procalcitonin algorithms for antibiotic therapy decisions: A systematic review of randomized controlled trials and recommendations for clinical algorithms. Arch Intern Med. 2011;171(15):1322.)

The advent of antibiotic therapy led to dramatic reductions in mortality and morbidity rates due to bacterial infections and sepsis.1 However, overuse of antibiotics to fight infections may cause considerable harm by exposing individual patients to adverse events resulting from antibiotic use and by increasing the development of bacterial resistance. Combating the emergence of bacterial resistance to antimicrobial agents requires more effective efforts to reduce the inappropriate or unnecessarily prolonged use of antibiotics.2

In this example, the first sentence is based on information from source 1.  The second and third sentences are based on information from source 2.

 

 

Exception to the rules of thumb above — discussions of studies or works that are named in the text.  

It is not necessary to include an in-text citation in every paragraph when an entire clearly defined section of your paper or an entire table discusses a single work. In these cases you can cite the source once at the beginning of the section/paragraph/table.   An example follows.  The example was taken  from Cohn DL, O’Brien R, Geiter L. Targeted tuberculin testing and treatment of latent tuberculosis infection. MMWR Morb Mortal Wkly Rep. 2000;4(9):1-61. I’ve changed the citation style to AMA style for teaching purposes. Here’s the excerpt:

Halsey et al. , The Haiti Study, 1990-1994

In the Haiti study conducted during 1990–1994, regimes of twice-weekly rifampin and pyrazinamide was well tolerated.110 No severe adverse reactions were observed; rates of abnormal liver function were low (1–3%). ….

The source, in this case entry 110 in the bibliography is only cited once at the beginning of the section of the paper that focuses solely on the Haiti Study.

 

 

When are citations unnecessary?

There are at least  four circumstances when in-text citations are not needed.

  1. When the content of a statement is considered common knowledge.

 

You don’t need to include a source for information that others with your level of expertise will feel is common knowledge. Typically this is information you know so well that you wouldn’t have consulted a resource while writing – theoretically there’s no chance of plagiarism.  Statements that are considered common knowledge don’t occur very often in student writing.  That said, there are instances when a statement is considered common student-level knowledge.  For example, you could certainly say — The COVID 19  pandemic disrupted many aspects of life around the globe — without citing a source.

 

  1. When you are describing your research plans (in a report concerning a research project you have completed or plan to complete)
  2. Your data and methods (in a report concerning a research project you have completed or plan to complete)
  3. A summary of your conclusions that doesn’t refer to the conclusions of others

 

 

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Questions, Problems, Text Errors?

Before you leave, …

  • Do you have any questions or do you feel that clarification of some aspect of the materials would be helpful?
  • Have you noticed any errors or problems with course materials that you’d like to report?
  • Do you have any other comments?

If so, you can submit questions, comments, corrections, and concerns a to Cindy Schmidt at  cmschmidt@unmc.edu.

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Introduction to Drug Information Copyright © by Cynthia M. Schmidt is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License, except where otherwise noted.