1. Welch, J.R., Hoerig, K.A. and R. Endfield, Jr. (2005) Enhancing Cultural Heritage Management and Research Through Tourism on White Mountain Apache Tribe Trust Lands. SAA Archaeological Records 5: 15–19.
2. Brugge, D. and Missaghian, M. (2005) Protecting the Navajo People through Tribal Regulation of Research. Science and Engineering Ethics 12: 491–507.
3. Aristotle (1985) Nicomachean Ethics. Translated by T. Irwin. Hackett Publishing, Indianapolis, IN, USA.
4. Downs, J.F. (1984) The Navajo, 3rd ed. Waveland Press, Inc., Prospect Heights, IL, USA.