Não informado. (2007). Report of the Division of the Agriculture. Iowa State College, Division of the Agriculture.
Chicago-Zitierstil (17. Ausg.)Não informado. Report of the Division of the Agriculture. Ames, Iowa: Iowa State College, Division of the Agriculture, 2007.
MLA-Zitierstil (8. Ausg.)Não informado. Report of the Division of the Agriculture. Iowa State College, Division of the Agriculture, 2007.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.