Standard Oil Company; Exxon Corporation (1957). The Lamp. Exxon Corp. p. 192. Retrieved 11 August 2011. - Navajo Rangers, riding in pick-up trucks and jeeps, are on constant patrol. Their job is to protect the natural beauties and the archeological sites of the Navajo homeland, and to assist travelers...
James F. Downs (February 1984). The Navajo. Waveland Press. p. 1. ISBN978-0-88133-037-3. Retrieved 11 August 2011. - Navajo rangers build roads, dams, and other tribal works and operate a separate park service and tribal highway and works departments
Navajo Times. January 1967. p. 132. Retrieved 1 December 2012. - Mr. Van Valkenburgh, who also was the founder of the Navajo Tribal Rangers, was so greatly beloved by the tribe that at the time of his death the Council held a memorial service.
