McMullen, L. H., R. L. Fiddick, and R. O. Wood. 1981. Bark beetles, Pseudohylesinus spp (Coleoptera: Scolytidae) associated with amabilis fir defoliated by Neodiprion sp (Hymenoptera: Diprionidae). Entomological Society of British Columbia, Journal 78:43-45.