According to the American Sociological Association website "the ASA Style Guide is the authoritative reference for writing, submitting, editing and copyediting manuscripts for ASA journals and other publications following ASA's unique format. ... The 5th edition has been updated based on the 16th edition of the Chicago Manual of Style, on which much of the ASA style is based."
Owl Perdue Formatting in Sociology (ASA Style) is a free, online site that gives a comprehensive description and examples of ASA citation style based on the fifth edition (2014) .
We have a print copy of the third edition (2007) of American Sociological Association Style Guide in the Reference collection on the main floor of the Library: Reference
The BU Writing Centre has created a short, two page summary of the style guide which has been posted to the BU Moodle site under Student Services - scroll to Writing Skills - see Topic 6.
A photocopy of ASA style guide is also available on Reserve at the Main Circulation Desk.