M. Mc Innis, Vavra, M., and Krueger, W. Clement,
“A Comparison of Four Methods Used to Determine the Diets of Large Herbivores”,
Journal of Range Management, vol. 36, no. 3, p. 302, 1983.
C. G. Parks, Endress, B. A., Vavra, M., Mc Innis, M., and Naylor, B. J.,
“Cattle, deer, and elk grazing of the invasive plant sulfur cinquefoil”,
Natural Areas Journal, vol. 28, pp. 404–409, 2008.