Citazione APA

Kempton,, W., Boster,, J. S., & Hartley,, J. A. (1996). Environmental values in American culture. MIT Press.

Stile di citazione Chicago

Kempton,, Willett, James S. Boster,, e Jennifer A. Hartley. Environmental Values in American Culture. London: MIT Press, 1996.

Citazione MLA

Kempton,, Willett, et al. Environmental Values in American Culture. MIT Press, 1996.