Bildstein, Keith. "Behavioral ecology of red-tailed hawks (Buteo jamaicensis), rough-legged hawks (B. lagopus), northern harriers (Circus cyaneus), American kestrels (Falco sparverius) and other raptorial birds wintering in south central Ohio /." Doctoral dissertation, Ohio State University, 1978. http://rave.ohiolink.edu/etdc/view?acc_num=osu14870824920381Chicago Manual of Style (17th edition)