S. A.  Nadler and Hafner, M. S., ?Systematic relationships among pocket gopher chewing lice (Phthiraptera: Trichodectidae) inferred from electrophoretic data?, International journal for parasitology, vol. 23, no. 2, pp. 191 - 201, 1993.

S. A.  Nadler and Hafner, M. S., ?Genetic differentiation in sympatric species of chewing lice (Mallophaga, Trichodectidae)?, Annals of the Entomological Society of America, vol. 82, no. 1, pp. 109 - 113, 1989.

M. S.  Hafner, Demastes, J. W., Hafner, D. J., Spradling, T. A., Sudman, P. D., and Nadler, S. A., ?Age and movement of a hybrid zone: Implications for dispersal distance in pocket gophers and their chewing lice?, Evolution, vol. 52, no. 1, pp. 278 - 282, 1998.

M. S.  Hafner and Nadler, S. A., ?Phylogenetic trees support the coevolution of parasites and their hosts?, Nature, vol. 332, pp. 258 - 259, 1988.

M. S.  Hafner and Nadler, S. A., ?Cospeciation in host-parasite assemblages: comparative analysis of rates of evolution and timing of cospeciation events?, Systematic Biology, vol. 39, no. 3, pp. 192 - 204, 1990.

S. A.  Nadler, Hafner, M. S., Hafner, J. C., and Hafner, D. J., ?Genetic differentiation amoung chewing louse populations (Mallophaga: Trichodectidae) in a pocket gopher contact zone (Rodentia: Geomyidae)?, Evolution, vol. 44, no. 4, pp. 942 - 951, 1990.

M. S.  Hafner, Sudman, P. D., Villablanca, F. X., Spradling, T. A., Demastes, J. W., and Nadler, S. A., ?Disparate rates of molecular evolution in cospeciating hosts and parasites?, Science, vol. 265, pp. 1087 - 1090, 1994.