APA (7th ed.) Citation

Knapp, B. J., McCrae, D., & Ross, S. (1989). Challenge of the natural environment. Longman.

Chicago Style (17th ed.) Citation

Knapp, Brian J., Duncan McCrae, and S.R.J Ross. Challenge of the Natural Environment. Essex: Longman, 1989.

MLA (9th ed.) Citation

Knapp, Brian J., et al. Challenge of the Natural Environment. Longman, 1989.