References
- Poehlman, J. M. 1987. Breeding field crops. Westport, Conn.: AVI Publishing.
- Poehlman, J. M., and Sleper, D. A. 1995. Breeding field crops. 4th ed. Ames: Iowa State University Press.
- Yapa, L. 1993. What are improved seeds? An epistemology of the Green Revolution. Economic Geography 69:254–73.