It is important to provide complete information about your primary or secondary source whether found in a printed source or online. The basic elements to include in a citation for a published print source are: author of the document, title of the document, title of the book if different from the document, name of editor or author of the book, place of publication, publisher, year, and page numbers. The basic elements to include in a citation for an online source are: author of the document, title of the document, title of the web site, author or producer of the web site, url, date (if given) and date accessed. Various style formats such as Chicago, MLA and APA put these elements in different order using different conventions. See the following web sites for further information and examples.
Citation Style Manuals Library Guide - ASU Library
This page that links to many of the most popular citation style formats
Citing Records in the National Archives of the United States: Citing Records in the National Archives of the United States: General Information Leaflet, Number 17: Introduction; Elements of Citations to Records of Federal Agencies; Guidelines for Citing Textual Records; Guidelines for Citing Microform Records; Guidelines for Citing Nontextual Records; Guidelines for Citing Electronic Records; Guidelines for Citing Records in Affiliated Archives; A Note on Citing Digitized Documents Available at NARA's World Wide Web Site
Who: Who is the author or sponsor of the website? Is that person or organization named? Is any supporting documentation available?
What: What is the mission or purpose of the website? Is it clearly articulated? What kinds of materials are on the website? Are they properly cited and acknowledged? What is the document format on the web?
Where: Where is the site located? Is there a physical address with phone number and email address for a contact person? Does the site have a .edu, .org, or .com address?
Why: Why does the site exist? Does it have a point of view or opinion? Is it pedagogical or polemic? Does it want something from you?