Heady, E. O. (1972). Agricultural and water policies and the environment: An analysis of national alternatives in natural resource use, food supply capacity and environmental quality. Ame: Iowa State University. Center for Agricultural and Rural Development.
Παραπομπή Chicago StyleHeady, Earl O. Agricultural and Water Policies and the Environment: An Analysis of National Alternatives in Natural Resource Use, Food Supply Capacity and Environmental Quality. Ame: Iowa State University. Center for Agricultural and Rural Development, 1972.
Παραπομπή MLAHeady, Earl O. Agricultural and Water Policies and the Environment: An Analysis of National Alternatives in Natural Resource Use, Food Supply Capacity and Environmental Quality. Ame: Iowa State University. Center for Agricultural and Rural Development, 1972.