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The APA Citation Style was created and is maintained by the American Psychological Association. This is the citation style most often used by researchers and writers of the behavioral sciences and the social sciences.
This is the official website for APA Style maintained by the American Psychological Association. Here you will find information about APA style, answers to frequently asked questions, and quick answers on how to cite non-traditional sources such as social media.
"The APA Style Blog is the official companion to the Publication Manual of the American Psychological Association, Sixth Edition. It's run by a group of experts who work with APA Style every day. We publish weekly posts to talk about what we love—writing, publishing, and APA Style. We explore what APA Style is and how it works in a variety of areas, including reference citations of every sort, grammar and usage, the publication process, and social media. Occasionally we feature guest bloggers who write about more technical issues."
Publication Manual of the American Psychological Association
This tutorial is designed for those who have no previous knowledge of APA Style®, 7th edition. It shows users how to structure and format their work, recommends ways to reduce bias in language, identifies how to avoid charges of plagiarism, shows how to cite references in text, and provides selected reference examples.
The online writing lab at Purdue has an excellent explanation of the general APA guidelines as well as many examples on how to cite your sources in-text and on the reference list. There is also a sample paper written in APA style.