Cita APA

Van der Smissen, B., Redman, F., & Goering, O. H. (1977). A leader's guide to nature-oriented activities (3rd ed.). Iowa State University Press.

Citación estilo Chicago

Van der Smissen, Betty, Francis Redman, and Oswald H. Goering. A Leader's Guide to Nature-oriented Activities. 3rd ed. Ames: Iowa State University Press, 1977.

Cita MLA

Van der Smissen, Betty, et al. A Leader's Guide to Nature-oriented Activities. 3rd ed. Iowa State University Press, 1977.