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- Kushmaul, R. J., M. D. Cain, C. E. Rowell, and R. L. Porterfield. 1979. Stand and site conditions related to southern pine beetle susceptibility . Forest Science 25:656-664.
- Porterfield, R. L., and C. E. Rowell. 1981. Characteristics of southern pine beetle infestations Southwide. Pages 87-108 in J. E. Coster and J. L. Searcy (eds.), Site, stand, and host characteristics of southern pine beetle infestations. United States Department of Agriculture, Forest Service, Technical Bulletin 1612. 115 p.