L. E. Olson, Oakleaf, R. J., Squires, J. R., Wallace, Z. P., and Kennedy, P. L.,
“Nesting Pair Density and Abundance of Ferruginous Hawks ( Buteo regalis ) and Golden Eagles ( Aquila chrysaetos ) from Aerial Surveys in Wyoming”,
Journal of Raptor Research, vol. 49, no. 4, pp. 400 - 412, 2015.