Gibson, J. A., & Timmons, J. F. (1978). Land use inventory and projection model with applications to Iowa and its subregions. Ames: Center for Agricultural and Rural Development. Iowa State University.
Παραπομπή Chicago StyleGibson, James A., and John F. Timmons. Land Use Inventory and Projection Model With Applications to Iowa and Its Subregions. Ames: Center for Agricultural and Rural Development. Iowa State University, 1978.
Παραπομπή MLAGibson, James A., and John F. Timmons. Land Use Inventory and Projection Model With Applications to Iowa and Its Subregions. Ames: Center for Agricultural and Rural Development. Iowa State University, 1978.
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