Lee, K. C., Short, C., & Heady, E. O. (1983). Net return functions for irrigation and dryland farming under different energy and crop prices in the southern Ogallala Aquifer. Ames: Center for Agricultural and Rural Development. Iowa State University.
Παραπομπή Chicago StyleLee, Kun C., Cameron Short, and Earl O. Heady. Net Return Functions for Irrigation and Dryland Farming Under Different Energy and Crop Prices in the Southern Ogallala Aquifer. Ames: Center for Agricultural and Rural Development. Iowa State University, 1983.
Παραπομπή MLALee, Kun C., Cameron Short, and Earl O. Heady. Net Return Functions for Irrigation and Dryland Farming Under Different Energy and Crop Prices in the Southern Ogallala Aquifer. Ames: Center for Agricultural and Rural Development. Iowa State University, 1983.