- Dyer, E. D. A., L. H. McMullen, and J. P. Skovsgaard. 1968. Rapports entre la temperature et les degres de development de deux Scolytes . Canada Department of Forestry, Canadian Forestry Service, Bi-monthly Research Notes 24:19-20.
- Dyer, E. D. A., J. P. Skovsgaard, and L. H. McMullen. 1968. Temperature in relation to development rates of two bark beetles . Canada Department of Forestry and Rural Development, Canadian Forestry Service, Bi-monthly Research Notes 24:15-16.
- Skovsgaard, J. 1968. Douglas-fir beetle in British Columbia. Canada Department of Forestry and Rural Development, Forestry Branch, Forest Insect and Disease Survey, Forest Pest Leaflet 14. 5 p.
- Skovsgaard, J. 1972. Douglas-fir beetle in British Columbia. Canada Department of Forestry and Rural Development, Forestry Branch, Forest Insect and Disease Survey, Forest Pest Leaflet 14. 5 p.