C. W. Boal, Andersen, D. E., Kennedy, P. L., and Roberson, A. M.,
“Northern goshawk ecology in the western Great Lakes region”,
Stud. Avian Biol. , vol. 31, pp. 128-136, 2006.
C. W. Boal, Andersen, D. E., and Kennedy, P. L.,
“Productivity and mortality of northern goshawks in Minnesota”,
J. Raptor Res., vol. 39, no. 3, pp. 222-228, 2005.