GSA (Geological Society of America)
In general, it seems that GSA journals use the Chicago Manual of Style (14th or 15th editions). The library has print copies of the Chicago Manual (see call numbers and locations below). The GSA site does provide a 'manuscript template' - which gives examples of all the different types of materials you could potentially cite. Check out this link: Manuscript Template
Chicago Manual of Style (15th Edition):
Z253 .U69 2003
Brown Science & Engineering Library (Reference)
Shannon Library (Reference)
Clemons (Reference)
Fine Arts (Reference)
Darden (Reference)
Duke University also have a great webpage guiding you on citing sources from various styles.
Duke citing sources page
RefWorks (citation management program)
RefWorks Login
RefWorks info page (UVa)
RefWorks Quick Start Guide