- Cole, W. E., and R. J. Klade. 1975. Black beetles and green trees. United States Department of Agriculture, Forest Service, Pamphlet 677-328/8 Region 8. 4 p.
- Klade, D. 1976. Those beetles in the trees. United States Department of Agriculture, Forest Service, Forestry Research: What's New in the West, p. 3-5.