Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

Willis, K. G., Kenneth John Button, e Peter Nijkamp. Environmental Valuation. Cheltenham, UK, Northampton, MA: Edward Elgar Pub, 1999.

Citatione MLA (9a ed.)

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