Kula, E. (1994). Economics of Natural Resources, the Environment and Policies (2nd. ed.). chapman & hall.
Lua i Stíl Chicago (17ú heag.)Kula, E. Economics of Natural Resources, the Environment and Policies. 2nd. ed. London: chapman & hall, 1994.
Lua MLA (9ú heag.)Kula, E. Economics of Natural Resources, the Environment and Policies. 2nd. ed. chapman & hall, 1994.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.