"A variety of selectors have named national champions throughout the years. They generally can be divided into three categories: those determined by mathematical formula, human polls, and historical research. The selectors below are listed in the official NCAA Football Bowl Subdivision Records as having been deemed to be ‘major selectors’ for which the criteria is that the poll or selector be ‘national in scope either through distribution in newspaper, television, radio and/or computer online’.“ – Wikipedia

Below is a comprehensive list of all recognized selectors: