The Online Writing Lab at Purdue provides an overview along with helpful examples.
MLA Handbook
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This is the ninth edition of the MLA Handbook published in 2021. Provides detailed examples showing how to treat different types of sources in notes and bibliography.
Tricollege guide for using Zotero. Starts with an introduction and installation. It then describeshow to use it as a versatile tool for research,organization, footnotes and bibliography.