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