Kula, E. (1994). Economics of Natural Resources, the Environment and Policies (2nd. ed.). chapman & hall.
Chicago-referens (17:e uppl.)Kula, E. Economics of Natural Resources, the Environment and Policies. 2nd. ed. London: chapman & hall, 1994.
MLA-referens (9:e uppl.)Kula, E. Economics of Natural Resources, the Environment and Policies. 2nd. ed. chapman & hall, 1994.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.