van der Valk. Wildflowers and Other Plants of Iowa Wetlands, 2nd edition. University of Iowa Press.
Chicago Style (17th ed.) Citationvan der Valk. Wildflowers and Other Plants of Iowa Wetlands, 2nd Edition. University of Iowa Press.
MLA (8th ed.) Citationvan der Valk. Wildflowers and Other Plants of Iowa Wetlands, 2nd Edition. University of Iowa Press.
Warning: These citations may not always be 100% accurate.