HARTWICK, J. M., & OLEWILER, N. D. (1986). The economics of natural resource use. Harper and Row.
Lua i Stíl Chicago (17ú heag.)HARTWICK, John M., agus Nancy D. OLEWILER. The Economics of Natural Resource Use. Cambridge: Harper and Row, 1986.
Lua MLA (9ú heag.)HARTWICK, John M., agus Nancy D. OLEWILER. The Economics of Natural Resource Use. Harper and Row, 1986.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.