1. Altevogt, R. — 1970. Origin and variability of alfalfa: a biosystematic survey ofMedicago. —Ph. D. Thesis.Dep. Biol., Washington Univ., St. Louis, Missouri. 172 pp.
2. Bass, M. H. — 1966. Temperatures lethal to the alfalfa weevil. —J. Econ. Entomol., 59, 1530–1.
3. Blickenstaff, C. C. — 1965. Partial intersterility of Eastern and Western U.S. strains of the alfalfa weevil. —Ann. Entomol. Soc. Am., 58, 523–526
4. Cothran, W. R. — 1972. A bibliography of the alfalfa weevil,Hypera postica (Gyllenhal), and the Egyptian alfalfa weevil,H. brunneipennis (Boheman), Suppl. II. —Bull. Entomol. Soc. Am., 18, 102–108.
5. Cook, W. C. — 1925. The distribution of the alfalfa weevil (Phytonomus posticus Gyll.). A study in physical ecology. —J. Agric. Res., 30, 479–91.