APA (7th ed.) Citation

Humphrey, J. H., & Humphrey, F. N. (1991). Recreation: Current selected research. AMS Press.

Chicago Style (17th ed.) Citation

Humphrey, James Harry, and Fred N. Humphrey. Recreation: Current Selected Research. New York: AMS Press, 1991.

MLA (9th ed.) Citation

Humphrey, James Harry, and Fred N. Humphrey. Recreation: Current Selected Research. AMS Press, 1991.

Warning: These citations may not always be 100% accurate.