Não informado. (1935). Iowa farm economist. Iowa State College of Agriculture and Mechanic Arts.
Chicago-referens (17:e uppl.)Não informado. Iowa Farm Economist. Ames, Iowa: Iowa State College of Agriculture and Mechanic Arts, 1935.
MLA-referens (8:e uppl.)Não informado. Iowa Farm Economist. Iowa State College of Agriculture and Mechanic Arts, 1935.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.