The Chicago Manual of Style
Publication Date: 2010-08-01
The sixteenth and latest edition of the Chicago Manual of Style is a comprehensive guide to writing and publishing with sections dedicated to non-English languages, grammar and bibliographical references.
CMS: Purdue Online Writing Lab - Provides an overview and basic examples by format primarily focusing on the notes-bibliography system
CMS Online - Full text of the print guide is available in electronic format allowing for quick searching and easy access (15th edition also available)
Publication Date: 2016-04-01
The eighth, and current edition of the MLA Handbook focuses on the core principles of citation and provides select examples by format in addition to writing mechanics.
MLA: Purdue Online Writing Lab - Useful information regarding MLA citation style, includes examples
MLA Style Center Website - Contains brief overview of citation format, includes examples, citation elements template and helpful tips
APA: Purdue Online Writing Lab - Provides detailed descriptions and examples of citation style by format, figures/tables, footnotes and endnotes and sample papers
APA Blog - APA Published Blog is authored by a group of style experts to explain the answers to frequently asked questions or delve into citation minutia