APA (7th ed.) Citation

Rosendahl, C. O., & Butters, F. K. (1931). A guide to the spring flowers of Minnesota ([6th ed.].). The University of Minnesota Press.

Chicago Style (17th ed.) Citation

Rosendahl, Carl Otto, and Frederic King Butters. A Guide to the Spring Flowers of Minnesota. [6th ed.]. Minneapolis: The University of Minnesota Press, 1931.

MLA (9th ed.) Citation

Rosendahl, Carl Otto, and Frederic King Butters. A Guide to the Spring Flowers of Minnesota. [6th ed.]. The University of Minnesota Press, 1931.