- Bousfield, W. E., S. K. Hagle, and S. Koiiler. 1988. Montana forest pest conditions and program highlights, 1987. United States Department of Agriculture, Forest Service, Northern Region, Missoula, Montana, Timber, Cooperative Forestry and Pest Management Report 88-2. 15 p.
- Gibson, K. E., S. K. Hagle, and S. Kohler. 1987. Montana forest pest conditions and program highlights, 1986. United States Department of Agriculture, Forest Service, Northern Region, Missoula, Montana, Cooperative Forestry and Pest Management Report 87-2. 29 p.
- Hagle, S. K., S. Tunnock, K. E. Gibson, and C. J. Gilligan. 1987. Field guide to diseases and insect pests of Idaho and Montana forests. United States Department of Agriculture, Forest Service, Northern Region, Missoula, Montana, State and Private Forestry. 123 p.
- Hagle, S., and R. Schmitz. 1993. Managing root disease and bark beetles. Pages 209-228 In T.D. Schowalter and G.M. Filip (eds.), Beetle-pathogen interactions in conifer forests. Academic Press: London.