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There are thousands of citation types, some created by professional organizations, such as APA (American Psychological Association) and MLA (Modern Language Association), while others are developed by individual journals, such as Nature. There's no need to memorize a citation style; just use the official guidelines to make sure your citations are accurate.
APA Tutorial: The Basics of APA Style
Official APA tutorial: Skim through for what you need or watch it all! "This tutorial is designed for those who have no previous knowledge of APA Style®. 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."
APA Style Guide
Even though most databases will cite a source for you, it's always a good idea to double-check what the database creates.
Purdue OWL: APA Format
This guide, produced by Purdue University's Online Writing Lab, shows you how to format citations. When you get a citation from a database, check it against the formats in this guide.