The Online Writing Lab (OWL) at Purdue University houses writing resources and instructional material, and we provide these as a free service of the Writing Lab at Purdue. Students, members of the community, and users worldwide will find information to assist with many writing projects. Teachers and trainers may use this material for in-class and out-of-class instruction.
APA Style Manual
Publication Manual of the American Psychological Association (6th ed.). by American Psychological Association
Zotero is a free and easy-to-use research tool that helps you collect, organize, and analyze research and lets you share it in a variety of ways. Zotero includes the best parts of older reference manager software — the ability to store author, title, and publication fields and to export that information as formatted references — and the best aspects of modern software and web applications, such as the ability to organize, tag, and search in advanced ways