Seitz, Wesley D; Halertow, Harold G; Nelson, Gerald C. (1994). Economics of resources, agriculture, and food / Wesley D. Seitz, Gerald C. Nelson, Harold G. Halcrow. New York :: McGraw-Hill, Inc,.
Seitz, Wesley D; Halertow, Harold G; Nelson, Gerald C. Economics of resources, agriculture, and food / Wesley D. Seitz, Gerald C. Nelson, Harold G. Halcrow. New York :: McGraw-Hill, Inc,, 1994
Seitz, Wesley D; Halertow, Harold G; Nelson, Gerald C. Economics of resources, agriculture, and food / Wesley D. Seitz, Gerald C. Nelson, Harold G. Halcrow. New York :: McGraw-Hill, Inc,, 1994.