Não informado. (1935). Iowa farm economist. Iowa State College of Agriculture and Mechanic Arts.
Style de citation Chicago (17e éd.)Não informado. Iowa Farm Economist. Ames, Iowa: Iowa State College of Agriculture and Mechanic Arts, 1935.
Style de citation MLA (8e éd.)Não informado. Iowa Farm Economist. Iowa State College of Agriculture and Mechanic Arts, 1935.
Attention : ces citations peuvent ne pas être correctes à 100%.