Guides to APA (American Psycological Association) Style 

• APA Style Guide - SUNY Old Westbury Library
• APA Formatting and Style Guide - Purdue University Writing Lab

Guides to ASA (American Sociological Assocation) Style

• ASA Formating - Purdue University Writing Lab
• ASA Quick Style Guide (PDF) - American Sociological Association

Guides to Chicago Manual of Style

• Chicago Manual of Style - Purdue University Writing Lab
• Chicago- Style Citation Quick Guide 

Guides to MLA (Modern Language Association) Style

• MLA Style Guide - SUNY Old Westbury Library
• MLA Formatting and Style Guide - Purdue University Writing Lab

Guide to Turabian Style  

• Turabian Quick Guide - Univ. of Chicago Press

Citation Generators

• Citation Machine (APA, MLA, Turabian, Chicago)
• BibMe (APA, MLA, Chicago, Turabian)
• KnightCite (APA, MLA, Chicago) 
• Zotero