An example of an APA in-text citation would look like this: Jones and Jones (2007) discovered the principle of excitation.
Reference citations also provide avenues for interested readers to follow up on aspects of your work -- they help weave the web of science.
You may wish to include citations for sources that add relevant information to your own work, or that present alternate views.
(For example: Allen 1996a, 1996b.) If the reference you are citing has two authors, use the following format: If your source of information is from written correspondence (a letter or e-mail), you would substitute the word "written" for the word "personal" above, and you would add the date of the letter (if dated).
Personal communications are generally not included in the References Cited or Bibliography section, although unpublished papers, reports or manuscripts should be.
Use an in-text citation whenever you are discussing an idea that is not your own.
Any information, including images, statistics, data, ideas, quotes or paraphrases, that you use from another source must be cited within the text of your paper.
There are, however, other reasons for citing references in scientific research papers.
Citations to appropriate sources show that you've done your homework and are aware of the background and context into which your work fits, and they help lend validity to your arguments.
The reference citation style described here is a version of the "Author, Date" scientific style, adapted from Hansen (1991) and the Council of Biology Editors (1994).
Harnack & Kleppinger (2000) have adapted "CBE style" to cite and document online sources.