- Jeffrey, R. N. 1930. The concentration of certain sugars in the bark of the western yellow pine as related to western pine beetle attraction. United States Department of Agriculture, Bureau of Entomology, Pacific Southwest Forest and Range Experiment Station, Unpublished report.
- Jeffrey, R. N. 1931a. Final report on the concentration of certain sugars in the bark of the yellow pine in relation to western pine beetle attraction. United States Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station, Unpublished report. 19 p.
- Jeffrey, R. N. 1931b. Second memorandum on nutritional studies of western pine beetle larvae. United States Department of Agriculture, Bureau of Entomology, Pacific Southwest Forest and Range Experiment Station, Unpublished report.
- Jeffrey, R. C. 1962. Blue stain of bark beetle infested pine . Canada Department of Forestry, Forest Entomology and Pathology Branch, Annual Report 1961:116-117.