- Kauffman, W., R. Waltz, and R. Cummings. 1998. Shoot feeding and overwintering behavior of Tomicus piniperda (Coleoptera: Scolytidae): implications for management and regulation . Journal of Economic Entomology 91:182-190.
- Sadof, C., R. Waltz, and C. Kellam. 1995. Differential shoot feeding by adult Tomicus piniperda (Coleoptera: Scolytidae) in mixed stands of native and introduced pines in Indiana . Great Lakes Entomologist 27:223-228.
- Waltz, R. 1996. European spruce bark beetle (Ips typographus (L)) interceptions in Indiana 1995 . Proceedings of the Indiana Academy of Science 105:3-4.