Hoffman, R. M. (2002). Wisconsin's natural communities: How to recognize them, where to find them. University of Wisconsin Press.
Chicago-Zitierstil (17. Ausg.)Hoffman, Randolph M. Wisconsin's Natural Communities: How to Recognize Them, Where to Find Them. Madison, Wis: University of Wisconsin Press, 2002.
MLA-Zitierstil (9. Ausg.)Hoffman, Randolph M. Wisconsin's Natural Communities: How to Recognize Them, Where to Find Them. University of Wisconsin Press, 2002.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.