APA (American Psychological Association) Style is widely used in the social sciences, business, and some of the life sciences.
There are two parts to referencing: the citations within the text of your paper ("in-text citations") and the reference list at the end of your paper.
The APA referencing style is an "author-date" system, so the citation in the text consists of the author(s) and year of publication given wholly or partly in round brackets.
This guide gives example citations for the most common information formats used in APA Style, as well as links to all types of sources used in a Reference List and specific formatting examples. Examples are based on the 6th edition of the Publication Manual of the American Psychological Association.
For more examples of APA citations, check out the APA Example Citation Guide.
For more APA formatting guidelines, check out the APA Formatting Guide.
The 2017 editorial style manual of the Institute of Electrical and Electronics Engineers (IEEE), a style commonly used in technical fields like computer science.
The complete IEEE Editorial Style Manual (PDF) is free to download from IEEE and contains a formal set of editorial guidelines for IEEE Transactions, Journals, and Letters.