.Conrad, J. M., & .Clark, C. W. (1987). Natural resource economics: Notes and problems. Cambridge University Press.
Dyfyniad Arddull Chicago.Conrad, Jon M., and Colin W. .Clark. Natural Resource Economics: Notes and Problems. [Cambridge [Cambridgeshire ; New York: Cambridge University Press, 1987.
Dyfyniad MLA.Conrad, Jon M., and Colin W. .Clark. Natural Resource Economics: Notes and Problems. Cambridge University Press, 1987.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.