APA (7th ed.) Citation

Humphrey, F. N., & Humphrey, J. H. (1989). Recreation: Current selected research. AMS Press.

Chicago Style (17th ed.) Citation

Humphrey, Fred N., and James H. Humphrey. Recreation: Current Selected Research. New York: AMS Press, 1989.

MLA (9th ed.) Citation

Humphrey, Fred N., and James H. Humphrey. Recreation: Current Selected Research. AMS Press, 1989.