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Citing Sources & Style Guides like MLA and APA

Use this guide to identify books, websites, social media feeds, and citation management programs to help you follow the correct style, including correct citation formats, for your classes.

Don't Let This Happen to You


Image copyright Dave Coverly,, 2003.

What Is Plagiarism?

Plagiarism is using someone else's words or ideas without giving credit to the source. Many students plagiarize unintentionally, so make sure you know that plagiarism happens whenever you fail to include an in-text citation with a corresponding entry in your References or Works Cited pages. It doesn't matter if you use someone else's exact words (quote), paraphrase, or summarize: all these formats require citation. Also, citation or credit is required no matter where you find ideas or data. It doesn't matter if you're citing a peer-reviewed article, a book published by Yale University, a web site without an author, or a Tweet. All require credit. In higher education, plagiarism can lead to a failed grade or worse; in real life, it can lead to a damaged reputation or a job loss.

See our guide Academic Integrity and Avoiding Plagiarism for more detailed information.

For additional online resources, see Using Research  from the Purdue OWL, especially the sections titled Quoting, Paraphrasing, and Summarizing and Plagiarism FAQ.

Selected Books About Plagiarism