Não informado. AERR. University of Illinois at Urbana-Champaign, Agricultural Experiment Station.
Chicago-Zitierstil (17. Ausg.)Não informado. AERR. Urbana, Ill: University of Illinois at Urbana-Champaign, Agricultural Experiment Station.
MLA-Zitierstil (8. Ausg.)Não informado. AERR. University of Illinois at Urbana-Champaign, Agricultural Experiment Station.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.