Dyfyniad APA

Pearce, D. W., & Turner, R. K. (1990). Economics of natural resources and the environment. Johns Hopkins University Press.

Dyfyniad Arddull Chicago

Pearce, David W., and R. Kerry Turner. Economics of Natural Resources and the Environment. Baltimore: Johns Hopkins University Press, 1990.

Dyfyniad MLA

Pearce, David W., and R. Kerry Turner. Economics of Natural Resources and the Environment. Johns Hopkins University Press, 1990.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.