United States. Dept. of the Interior. (1972). Hearings before the Secretary of the Interior on leasing of oil lands and natural-gas wells in Indian Territory and territory of Oklahoma: May 8, 24, 25, and 29, and June 7 and 19, 1906. Arno Press.
Παραπομπή σε μορφή Chicago (17η εκδ.)United States. Dept. of the Interior. Hearings Before the Secretary of the Interior on Leasing of Oil Lands and Natural-gas Wells in Indian Territory and Territory of Oklahoma: May 8, 24, 25, and 29, and June 7 and 19, 1906. New York: Arno Press, 1972.
Παραπομπή σε μορφή MLA (8th εκδ.)United States. Dept. of the Interior. Hearings Before the Secretary of the Interior on Leasing of Oil Lands and Natural-gas Wells in Indian Territory and Territory of Oklahoma: May 8, 24, 25, and 29, and June 7 and 19, 1906. Arno Press, 1972.