The feeding response of some forest birds to the black-headed budworm. 1970. Gage, S.H.; Miller, C.A.; Mook, L.J. Can. J. Zool. 48: 359-366.
Digestion of spruce budworm larvae and pupae in the olive-backed thrush, Hylochichla ustulata swainsoni (Tschudi) 1965. Mook, L.J.; Marshall, H.G.W. The Canadian Entomologist 97: 1144-1149.