- Balch, R. E., L. J. Simpson, and M. L. Prebble. 1934. The European spruce sawfly outbreak in the Gaspe Peninsula . Entomological Society of Ontario, Proceedings 64:57-59.
- Davidson, A. G., W. R. Newell, and L. J. Simpson. 1962. Deterioration of windthrown red spruce in Nova Scotia . Canada Department of Forestry, Forest Entomology and Pathology Branch, Bi-monthy Progress Report 18:1.
- Simpson, L. J. 1929a. The biology of the Canadian barkbeetles: the seasonal history of Dendroctonus simplex LeC . Canadian Entomologist 61:274-279.
- Simpson, L. J. 1929b. The seasonal history of Polygraphus rufipennis Kirby . Canadian Entomologist 61:146-151.
- Simpson, L. J. 1951. Prevention of damage by borers in softwood logs or fire killed timber. Canada Department of Agriculture, Science Service, Forest Biology Division (processed).
- Stone, C., and J. A. Simpson. 1987. Influence of Ips grandicollis on the incidence and spread of bluestain fungi in Pinus elliottii billets in north-eastern New South Wales . Australian Forestry 50:86-94.
- Eldridge, R., and J. Simpson. 1987. Development of contingency plans for use against exotic pests and diseases of trees and timber, 3. Histories of control measures against some introduced pests and diseases of forests and forest products in Australia. Australian Forestry 50:24-36.
- Kent, D., and J. Simpson. 1992. Eusociality in the beetle Austroplatypus incomptus (Coleoptera: Platypodidae) . Naturwissenschaften 79:86-87.
- Stone, C., and J. Simpson. 1990. Species associations in Ips grandicollis galleries in Pinus taeda . New Zealand Journal of Forest Science 20:75-96.
- Stone, C., and J. Simpson. 1991a. Effect of six chemicals on the insects, mites, nematodes and fungi associated with Ips grandicollis (Eichhoff) (Coleoptera: Scolytidae) in northeastern New South Wales . Journal of the Australian Entomological Society 30:21-28.
- Stone, C., and J. Simpson. 1991b. Influence of cell viability of freshly felled Pinus elliotti on the subcortical community associated with Ips grandicollis (Coleoptera: Scolytidae) . Canadian Journal of Forest Research 21:1006-1011.
- Reeve, J., J. Simpson, and J. Fryar. 1996. Extended development in Thanasimus dubius (F) (Coleoptera: Cleridae), a predator of the southern pine beetle . Journal of Entomological Science 31:123-131.
- Simpson, R., and D. Coy. 1999. An ecological atlas of forest insect defoliation in Canada 1980-1996. Canadian Forestry Service, Atlantic Forestry Centre (Fredericton, New Brunswick), Information Report M-X-206E. 15 pp.