Helzer. The Ecology and Management of Prairies in the Central United States. University of Iowa Press.
Chicago-Zitierstil (17. Ausg.)Helzer. The Ecology and Management of Prairies in the Central United States. University of Iowa Press.
MLA-Zitierstil (8. Ausg.)Helzer. The Ecology and Management of Prairies in the Central United States. University of Iowa Press.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.