1. Avoid plagiarism. Give proper credit/attribution to someone else's ideas.
2. Give your reader enough information and accurate information to enable location of what you have cited.
Geological Society of America (GSA) Citations
Dr. Benison requires that you use the citation style for manuscripts which are submitted to Geological Society of America (GSA) journals. GSA provides a printable Manuscript Style document linked from their Reference Guidelines and Examples page. Here is an even briefer guide suitable for printing.