Heritage, S., S. Collins, and H. F. Evans. 1989. A survey of damage by Hylobius abietis and Hylastes spp. in Britain. Pages 36-42 in R. I. Alfaro and S. G. Glover, Insects affecting reforestation: biology and damage. Government of Canada, Department of Forestry, Pacific Forestry Centre, Victoria, British Columbia. 256 p.