- Koehler, C. S., G. G. Gyrisco, L. D. Newsom, and H. H. Schwardt. 1961. Biology and control of the clover root borer, Hylastinus obscurus (Marsham). Cornell University (New York) Agricultural Experiment Station, Memoir 376. 36 p.
- Lincoln, C. G., L. D. Newsom, and H. H. Schwardt. 1943. Entomology and limnology. Studies on the biology and control of the clover root borer, Hylastinus obscurus. Cornell Agricultural Experiment Station, Annual Report for 1942, 55:127-128.
- Marshall, D. S., L. D. Newsom, G. G. Gyrisco, and H. H. Schwardt. 1949. Control of the clover root borer . Journal of Economic Entomology 42:315-318.
- Schwardt, H. H., L. D. Newsom, and L. B. Norton. 1947. Increasing red clover yields by treatment with DDT or hexachlorocyclohexane . Journal of Economic Entomology 40:363-365.