- Brown, R. G., and D. G. Collis. 1968. Forest insect and disease survey: South Prince Rupert District. Pages 63-73 in Canada Department of Forestry and Rural Development, Forest Insect and Disease Survey, British Columbia 1967, Forest Research Laboratory, Information Report BC-X-16. 238 p.
- Collis, D. G., and N. E. Alexander. 1966a. Damage to western white pine on Vancouver Island by the mountain pine beetle, 1964. Canada Department of Forestry, Canadian Forestry Service, Forest Research Laboratory, Victoria, British Columbia, Interim Report.
- Collis, D. G., and N. E. Alexander. 1966b. Mountain pine beetle damage to western white pine on Vancouver Island. Canada Department of Forestry and Rural Development, Forest Research Laboratory, Victoria, British Columbia, Information Report BC-X-9. 5 p.
- Collis, D. G., and J. W. E. Harris. 1970. Status of the spruce beetle in British Columbia, 1969. Canada Department of Fisheries and Forestry, Forestry Branch, Forest Research Laboratory, Victoria, British Columbia, Information Report BC-X-40. 12 p.