Não informado. Iowa State College bulletin. Iowa State College of Agriculture and Mechanic Arts.
Chicago-Zitierstil (17. Ausg.)Não informado. Iowa State College Bulletin. Ames, Iowa: Iowa State College of Agriculture and Mechanic Arts.
MLA-Zitierstil (8. Ausg.)Não informado. Iowa State College Bulletin. Iowa State College of Agriculture and Mechanic Arts.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.