Schraufnagel, S. A., & Heady, E. O. (1980). Supply control and U.S. agriculture: An analysis of national and regional impacts under land and fertilizer restrictions. Ames, Iowa: Center for Agricultural and Rural Development, Iowa State University.
Παραπομπή Chicago StyleSchraufnagel, Stanley A., and Earl Orel Heady. Supply Control and U.S. Agriculture: An Analysis of National and Regional Impacts Under Land and Fertilizer Restrictions. Ames, Iowa: Center for Agricultural and Rural Development, Iowa State University, 1980.
Παραπομπή MLASchraufnagel, Stanley A., and Earl Orel Heady. Supply Control and U.S. Agriculture: An Analysis of National and Regional Impacts Under Land and Fertilizer Restrictions. Ames, Iowa: Center for Agricultural and Rural Development, Iowa State University, 1980.