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MLA style is most commonly used in Humanities disciplines such as English and Comparative Literature. There are many sources online for MLA style (including Dartmouth's Sources handbook and the Purdue OWL MLA Guide) but the MLA Handbook (9th edition) would be considered the definitive source for resolving any questions around MLA citation style.
Generaly, MLA style uses in-text parenthetical citations with a list of works cited. If your instructor requires you to use footnotes or endnotes, consult Appendix B of the MLA Handbook.
The new, ninth edition builds on the MLA's unique approach to documenting sources using a template of core elements--facts, common to most sources, like author, title, and publication date--that allows writers to cite any type of work, from books, e-books, and journal articles in databases to song lyrics, online images, social media posts, dissertations, and more.