APA (7th ed.) Citation

Willis, K. G., Button, K. J., & Nijkamp, P. (1999). Environmental valuation. Edward Elgar.

Chicago Style (17th ed.) Citation

Willis, K. G., Kenneth John Button, and Peter Nijkamp. Environmental Valuation. Cheltenham [etc.]: Edward Elgar, 1999.

MLA (9th ed.) Citation

Willis, K. G., et al. Environmental Valuation. Edward Elgar, 1999.