Here are a few sources that discuss the entire GPS or parts of it:
Board for Certification of Genealogists. The BCG Genealogical Standards Manual. Orem, Utah: Ancestry Publishing, 2000.
Mills, Elizabeth Shown. Evidence Explained: Citing History Sources from Artifacts to Cyberspace. Baltimore: Genealogical Publishing Company, 2007.
Mills, Elizabeth Shown. Evidence! Citation & Analysis for the Family Historian. Baltimore: Genealogical Publishing Company, 1997.
Mills, Elizabeth Shown, editor. Professional Genealogy: A Manual for Researchers, Writers, Editors, Lecturers, and Librarians. Baltimore: Genealogical Publishing Company, 2001.
Rose, Christine. Genealogical Proof Standard: Building a Solid Case. San Jose: CR Publications, 2005.