Não informado. (1935). Iowa farm economist. Iowa State College of Agriculture and Mechanic Arts.
Cita Chicago Style (17a ed.)Não informado. Iowa Farm Economist. Ames, Iowa: Iowa State College of Agriculture and Mechanic Arts, 1935.
Cita MLA (8a ed.)Não informado. Iowa Farm Economist. Iowa State College of Agriculture and Mechanic Arts, 1935.
Precaución: Estas citas no son 100% exactas.