A citation is needed usually when:
You are stating someone else's words, thoughts, or ideas
New information that is considered "uncommon knowledge"
You refer to or use an image, clip, tweet, post, website, etc.
You use your own words, thoughts, or ideas that you have stated in previous work.
A citation is not usually needed when:
You are stating YOUR opinion on a subject (i.e. I really do not like the new Star Wars as much as it was hyped up to be.)
It is common knowledge (i.e. Nashville is the capital of Tennessee in the United States.)
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The AMA Manual of Style: A Guide for Authors and Editors, Tenth Edition is mainly used for medical or scientific publishing. Below are some great resources to cite in AMA. Access to the Eleventh Edition is coming soon!
APA (American Psychological Association)
The Publication Manual of the American Psychological Association, Seventh Edition is commonly used to cite in the social and behavioral sciences, natural sciences, nursing, communications, education, business, and engineering to name a few. Please check with your department or professor to see what citation style is preferred. Some resources include:
Looking for 6th edition resources? Check out the APA Style Sixth Edition Resources page for links to the archived style blog, sample papers, quick answers, and supplemental materials.
This style is mainly used in Historical Research. Below are some great resources to cite in Chicago or Turabian.