• APA Style - American Psychological Association Style - This style is most often used by scholars and students in psychology, political science, and other social sciences.
• APA Style Bibliographic Entries - An excellent guide to traditional sources of explanation.
• Bibliography Style Handbook - Summarizes and illustrates the bibliographical formatting rules for APA.
• Citing Electronic Resources: APA-Style - This online guide is based on the APA style of documentation, providing instruction on research techniques and proper APA based citations.
• Citing Sources Using the APA Style  - Provides comprehensive coverage of APA documentation.
• Electronic Reference Formats Recommended by the American Psychological Association - This is the APA official site for documenting electronic sources.
• How to Cite Information from the Internet and the World Wide Web (American Psychological Association)
• Using APA Style to Cite and Document Sources - A complete guide to documenting electronic sources.
• WSU Writing Web - A great site to search for both APA and MLA style of documentation.

MLA (Modern Language Association) Style

• A Guide for Writing Research Papers based on Modern Language Association (MLA) Documentation (Capital Community-Technical College)
• MLA Format from the University of Illinois at Urbana - Champaign -  One of the best sites to consult for this style of documentation.  The site covers everything you want to know about MLA style from A-Z.
• Electronic Sources: MLA Style of Citation - From Li and Crane's Electronic Styles: A Handbook
• MLA-Style Citations of Electronic Sources - Presents a guide to locating and using the elements of citation for MLA as well as other documentation styles.

Turabian; Chicago Style Guides

• A Guide to Turabian's: A Manual for Writing
• Using Chicago Style to Cite and Document Sources - An excellent guide to documenting sources using the Turabian style.  Well organized, includes how to document electronic sources.
• Turabian Style: Sample Footnotes and Bibliographic Entries - An excellent guide, short, brief and to the point, includes how to document electronic sources.

Government Publications

• Uncle Sam - Brief Guide to Citing Government Publications - An excellent guide to citing various types of government publications, including electronic sources.
• Citing Records in the National Archives of the United States - The complete guide to citing government information resources: a manual for writers and librarians.
• Government Documents: Citing Government Documents - A well organized online guide providing great explanations and examples of most common government document citations.

Legal Citations Style

• Introduction to Basic Legal Citation - One of the best guides for coverage of how to cite legal sources.
• Understanding Legal Citations - A well organized and complete guide to legal citation.
• Drafting Legislative and Legal - Provides links to sites about drafting legal and legislative documents.
• APSA (American Political Science Association) Documentation - Prom the University of Wisconsin-Madison Writing Center - Gives examples of citations and references from The Style Manual for Political Science, rev. ed. 1993 and The Chicago Manual of Style, 14th ed., 1993.

ACS (American Chemical Society) Style

• American Chemical Society (ACS) Style Sheet - A well organized guide to citing print sources using the ACS style of documentation.
• ACS Citation Style for Internet Sources - a very good site to refer to for citing online sources using this style of documentation.

AMA (American Medical Association) Style

• American Medical Association Style Guide - A brief but concise guide to the AMA style of citing print sources.

NLM (National Library of Medicine) Style

• National Library of Medicine Style Guide - An excellent reference site covering the NLM's recommended style for citing print resources.
• A Guide to Citing Electronic Sources - An excellent guide to citing electronic resources using the NLM's recommended style of documentation.  Also recommended by the International Committee of Medical Journal Editors.
• Uniform Requirements for Manuscripts Submitted to Biomedical Journals - An authoritative site developed by the International Committee of Medical Journal Editors, includes an online site for NLM style of documentation.

CBE (COUNCIL OF BIOLOGY EDITORS) STYLE GUIDES

• CBE Documentation - from the University of Wisconsin - Based on the "scientific style and format" by the Council of Biology Editors.
• CBE Style Form Guide - Scientific Style and Format - The CBE Manual for Authors, Editors, and Publishers 6th edition.  Provides citation examples in name-year format.
• Biology Style Page - Provides examples of citing print sources using the CBE Style Manual.
• CBE Scientific Style Format - Includes two systems of documentation, the citation-sequence system and the name-year system.  Both are often used with variations in scientific and healthcare professions.
• Research and Documentation in the Electronic Age: The Sciences: CBE Style - A great reference site for citing electronic resources using the CBE Style.