1. Butterworth, Rod R., and Mickey Flodin 1991 The Perigee Visual Dictionary of Signing. TheBerkeley Publishing Group, New York.
2. Chamberlain, Von Del 1982 When Stars Came Down To Earth, Cosmology ofthe Skidi Pawnee Indians of North America. Ballena Press Anthropological Papers No. 26. Los Altos, CA.
3. Clark, William P. 1885 The Indian Sign Language. L.R. Hamersly & Co. Philadelphia. Reprinted by the University of Nebraska Press, Linclon.
4. Dorsey, George A. 1904 The Mythology of the Wichita. Carnegie Institution of Washington, Publication No. 21. Washington, D.C. Reprinted by the University of Oklahoma Press, Norman.
5. Gustason, Gerilee, and Esther Zawolkow 1993 Signing Exact English. Modem Signs Press, Inc., Los Alamitos, CA.