Forrest, Earle R. Arizona's Dark and Bloody Ground; an authentic account of the sanguinary Pleasant Valley vendetta that swept through Arizona's cattleland in the latter eighteen eighties--the Graham-Tewksbury feud. Caldwell, Idaho: Caxton Printers, Ltd. 1936: 15, 292. OCLC 1825248.
Burnham, Frederick Russell. Scouting on Two Continents. Doubleday, Page & company. 1926: 2; Chapters 3 & 4. OCLC 407686.