Citation styles are most often derived from professional associations and researchers, some have official guides and others are merely popular names given to a type of style that has several variants. The three most popular styles at Laurentian are APA, MLA, and Chicago.
Remember to use the style recommended by your professor.
APA is the most often used style guide in the social sciences and humanities.
APA Format (Online Writing Lab (OWL) at Purdue University)
APA Style official site - format and reference guidelines
Commonly used in the humanities and social sciences
Chicago Manual of Style (Online Writing Lab (OWL) at Purdue University)
The Harvard style is most commonly used in Sciences. There is no official guide for Harvard, which is a popular name for various forms of parenthetical referencing.
Harvard System (Anglia Ruskin University, UK)
The IEEE Editorial Style Manual is most commonly used in Engineering and technological sciences.
IEEE Editorial Style Manual (IEEE Author Center)
MLA style guide is most commonly used in the Humanities.
MLA Format (Online Writing Lab (OWL) at Purdue University)
Vancouver Citation Style (NLM) is primarily used in medical research.
The NLM Style Guide for Authors, Editors, and Publishers (National Library of Medicine)
How to Cite Statistics Canada Products (Statistics Canada)