This tutorial was developed by the American Psychological Association and "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."
Purdue University has put together a useful resource to help students understand how to do parenthetical citations, end notes, footnotes, etc. This site includes sample papers for formatting purposes and several other examples.