Grant, Ulysses S. (1912). "Chiricahua Reservation ~ December 14, 1872" [Executive Orders Relating to Indian Reserves, from May 14, 1855, to July 1, 1902]. Internet Archive. United States Government Printing Office. pp. 5–6. LCCN34008449.
Hoijer, Harry (1943). "Pitch Accent in the Apachean Languages". Language. 19 (1): 38–41. doi:10.2307/410317. JSTOR410317.
loc.gov
lccn.loc.gov
Grant, Ulysses S. (1912). "Chiricahua Reservation ~ December 14, 1872" [Executive Orders Relating to Indian Reserves, from May 14, 1855, to July 1, 1902]. Internet Archive. United States Government Printing Office. pp. 5–6. LCCN34008449.