Cita APA (7a ed.)
Tryon, R. M. (1980). Ferns of Minnesota (2d ed., rev.). University of Minnesota Press.
Cita Chicago Style (17a ed.)
Tryon, Rolla Milton. Ferns of Minnesota. 2d ed., rev. Minneapolis: University of Minnesota Press, 1980.
Cita MLA (9a ed.)
Tryon, Rolla Milton. Ferns of Minnesota. 2d ed., rev. University of Minnesota Press, 1980.
Precaución: Estas citas no son 100% exactas.