Citation Resources:
Online Writing Lab (OWL) at Purdue University’s Research and Citation Resources
MLA (Modern Language Association) Resources
MLA Handbook. 8th ed., Modern Language Association of America, 2016.
The MLA Style Center https://style.mla.org/
Ask the MLA FAQ https://style.mla.org/category/ask-the-mla/
Behind the Style Blog https://style.mla.org/category/behind-the-style/
APA (American Psychological Association) Resources
Publication Manual of the American Psychological Association. 7th ed., American Psychological Association, 2019.
APA Style https://apastyle.apa.org/
APA Style Instructional Aids https://apastyle.apa.org/instructional-aids/
APA Style Blog https://apastyle.apa.org/blog/
Chicago Resources
The Chicago Manual of Style. 17th ed., University of Chicago Press, 2017.
Chicago Style Citation Quick Guide https://www.chicagomanualofstyle.org/tools_citationguide.html
Chicago Style Q&A https://www.chicagomanualofstyle.org/qanda/topicList
CMOS Shop Talk blog https://cmosshoptalk.org/
NLM (National Library of Medicine) Resources
Citing Medicine: the NLM Style Guide for Authors, Editors, and Publishers. 2nd ed., National Library of Medicine, 2007.
Find it online at https://www.ncbi.nlm.nih.gov/books/NBK7256/
Samples of Formatted References for Authors of Journal Articles https://www.nlm.nih.gov/bsd/uniform_requirements.html