Beard, J. S., Goodall, D. W. 1., Blair, W. F. 1., Low, B. S., & MacMahon, J. A. (1976). Evolution of desert biota. Austin: University of Texas Press.

Beard, John S., David W. 1914- Goodall, W. Frank 1912- Blair, Bobbi S. Low, and James A. MacMahon. Evolution of Desert Biota. Austin: University of Texas Press, 1976.

Beard, John S., et al. Evolution of Desert Biota. Austin: University of Texas Press, 1976.