.Conrad, J. M., & .Clark, C. W. (1987). Natural resource economics: Notes and problems. Cambridge University Press.
Citazione stile Chigago Style (17a edizione).Conrad, Jon M., e Colin W. .Clark. Natural Resource Economics: Notes and Problems. [Cambridge [Cambridgeshire ; New York: Cambridge University Press, 1987.
Citatione MLA (9a ed.).Conrad, Jon M., e Colin W. .Clark. Natural Resource Economics: Notes and Problems. Cambridge University Press, 1987.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.