Gage, W. W., & Ohannessian, S. (1969). Teaching English to speakers of Choctaw, Navajo, and Papago: A contrastive approach. Washington, D.C.: Office of the Assistant Commissioner for Education, U.S. Bureau of Indian Affairs.

Gage, William W., and Sirarpi Ohannessian. Teaching English to Speakers of Choctaw, Navajo, and Papago: A Contrastive Approach. Washington, D.C.: Office of the Assistant Commissioner for Education, U.S. Bureau of Indian Affairs, 1969.

Gage, William W., and Sirarpi Ohannessian. Teaching English to Speakers of Choctaw, Navajo, and Papago: A Contrastive Approach. Washington, D.C.: Office of the Assistant Commissioner for Education, U.S. Bureau of Indian Affairs, 1969.