ALA is most often used in the disciplines of education, nursing, and social sciences.
https://apastyle.apa.orgOnline APA Style Guide
Chicago Style is most often used in the disciplines of history and religion.
MLA is most often used in the disciplines of english, music, philosophy.
Cite anything you write or create that uses or refers to the ideas of another person, including:
You do not need to cite information that is common knowledge.
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