Hartwick, J. M., & Olewiler, N. D. (1998). The Economics of natural resource use (2nd ed.). Addison-Wesley.
Lua i Stíl Chicago (17ú heag.)Hartwick, John M., agus Nancy D. Olewiler. The Economics of Natural Resource Use. 2nd ed. Reading, Mass: Addison-Wesley, 1998.
Lua MLA (9ú heag.)Hartwick, John M., agus Nancy D. Olewiler. The Economics of Natural Resource Use. 2nd ed. Addison-Wesley, 1998.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.