APA (7e ed.) Bronvermelding

Runkel, S. T., & Bull, A. F. (2009). Wildflowers of Iowa woodlands (2nd ed.). University of Iowa Press.

Chicago (17e ed.) Bronvermelding

Runkel, Sylvan T., en Alvin F. Bull. Wildflowers of Iowa Woodlands. 2nd ed. Iowa City: University of Iowa Press, 2009.

MLA (9e ed.) Bronvermelding

Runkel, Sylvan T., en Alvin F. Bull. Wildflowers of Iowa Woodlands. 2nd ed. University of Iowa Press, 2009.