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.
Quick reference for the writing style guidelines from the American Medical Association for the medical sciences community.
Citing Medicine provides assistance to authors in compiling lists of references for their publications, to editors in revising such lists, to publishers in setting reference standards for their authors and editors, and to librarians and others in formatting bibliographic citations.
Chicago Style is most often used in the disciplines of history and religion.
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