APA (7th ed.) Citation

Douglass, R. W. (1977). Forest recreation (2nd ed.). Pergamon Press.

Chicago Style (17th ed.) Citation

Douglass, Robert W. Forest Recreation. 2nd ed. New York: Pergamon Press, 1977.

MLA (9th ed.) Citation

Douglass, Robert W. Forest Recreation. 2nd ed. Pergamon Press, 1977.