APA (7th ed.) Citation

Knapp, C. E. (1971). Outdoor activities for environmental studies. Instructor Publ.

Chicago Style (17th ed.) Citation

Knapp, Clifford E. Outdoor Activities for Environmental Studies. Dansville, N.Y: Instructor Publ, 1971.

MLA (9th ed.) Citation

Knapp, Clifford E. Outdoor Activities for Environmental Studies. Instructor Publ, 1971.