Dyfyniad APA

Kula, E. (1994). Economics of Natural Resources, the Environment and Policies (2nd. ed.). chapman & hall.

Dyfyniad Arddull Chicago

Kula, E. Economics of Natural Resources, the Environment and Policies. 2nd. ed. London: chapman & hall, 1994.

Dyfyniad MLA

Kula, E. Economics of Natural Resources, the Environment and Policies. 2nd. ed. chapman & hall, 1994.

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