- Caird, R. W. 1935. Physiology of pines infested with bark beetles . Botanical Gazette 96:709-733.
- St. George, R. A., and R. W. Caird. 1929. Report on trees medications studies. United States Department of Agriculture, Bureau of Entomology, Division of Forest Insects, Asheville, North Carolina. 13 p. (typewritten report).