The Wittenberg Writing Center has compiled a long list of various online style guides.
Style manuals can be confusing (i.e. what does it mean to be "paginated by volume"?). For assistance, consult your instructor, the Writing Center, or a reference librarian.
Purdue Online Writing Lab (OWL) is a well-respected online resource for citation style assistance. If you click this link and scroll down, you will notice some buttons on the left-hand side that highlight guides for MLA, APA, and Chicago styles.
The Chicago Manual of Style, 17th Edition
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MLA Handbook
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Publication Manual of the American Psychological Association
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Zotero - a free, easy-to-use tool to help you collect, organize, annotate, cite, and share research. The browser connector (available for Firefox, Chrome, Safari, and Edge) allows you to quickly and easily save sources as you find them online.
Just need to make a quick bibliography? Check out ZoteroBib. It is a free tool that requires no accounts or signups. It can look up articles and books via a DOI, ISBN, and more.
EndNote Web - save your sources (web pages, scholarly articles, books), choose a citation style, select sources from your account, and create a works cited or references page in APA, MLA, Chicago or another citation style.
Important Note -- Citation generators are error-prone, so be sure to proofread! Double-check spelling, capitalization, and punctuation to be sure the official style (MLA, APA, etc.) required for your assignment is followed.