1. Annotated list of forest insects of British Columbia Part XIII, Brephinae, Geometrinae, Sterrhinae, and Larentiinae (Geometridae);Sugden;J. ent. Soc. Br. Columb.,1966
2. Notes on the European winter moth in Nova Scotia;Smith;Can. Dep. Agric., For. Biol. Div., Bi-mon. Prog. Rep.,1950
3. The Life History and Dispersal of the Bruce Spanworm, Operophtera bruceata (Hulst), (Lepidoptera: Geometridae)
4. DISTINGUISHING LARVAE AND PUPAE OF THE WINTER MOTH, OPEROPHTERA BRUMATA, AND THE BRUCE SPANWORM, O. BRUCEATA (LEPIDOPTERA: GEOMETRIDAE)
5. Pests not known to occur in the United States or of limited distribution. Winter moth, Operophtera brumata (L.) (Lepidoptera: Geometridae);Ferguson;U.S. Dep. Agric. Coop. Pl. Pest Rep.,1978