Cita APA (7th ed.)

Conrad, J. M., & Clark, C. W. (1987). Natural resource economics. Cambridge University Press.

Cita Chicago (17th ed.)

Conrad, Jon M., i Colin Whitcomb Clark. Natural Resource Economics. Cambridge: Cambridge University Press, 1987.

Cita MLA (9th ed.)

Conrad, Jon M., i Colin Whitcomb Clark. Natural Resource Economics. Cambridge University Press, 1987.