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Academic Integrity

APA Style Guides and Citation Resources

MLA Style Guides and Citation Resources

ASA Style Guides and Citation Resources

Citation Managers

Citation managers collect and organize citations, and help you create reference lists.

The Metro State Library supports Zotero, an open source citation manager. To learn more, and for assistance in setting it up, visit our Zotero guide.

Finding DOIs

If a DOI (Digital Object Identifier) exists for a publication, the APA style manual requires that it be included at the end of the citation in the reference list. Sometimes DOIs are listed in the article databases, but not always. To doublecheck whether or not a DOI exists, use this search feature at

Writing and Grammar