Cita APA (7a ed.)

Rosendahl, C. O., & Butters, F. K. (1937). A Guide to the Spring Flowers of Minnesota (7th rev. ed.). University of Minnesota Press.

Cita Chicago Style (17a ed.)

Rosendahl, Carl Otto, y F. K. Butters. A Guide to the Spring Flowers of Minnesota. 7th rev. ed. Minneapolis: University of Minnesota Press, 1937.

Cita MLA (8a ed.)

Rosendahl, Carl Otto, y F. K. Butters. A Guide to the Spring Flowers of Minnesota. 7th rev. ed. University of Minnesota Press, 1937.