Columbia Guide to Online Style

This is the on-line companion to "The Columbia Guide to Online Style." It "resents a guide to locating, translating, and using the elements of citation for both a humanities style (i.e., MLA and Chicago) and a scientific style (APA and CBE) for electronically-accessed sources." The basics of their approach are described here.    

http://cup.columbia.edu/book/the-columbia-guide-to-online-style/9780231132114