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Lua i Stíl Chicago (17ú heag.)Virginia Polytechnic Institute and State University. Center for Environmental Studies, United States. Environmental Protection Agency. Region III, John Cairns, agus Kenneth L. Dickson. The Environment: Costs, Conflicts, Action. New York: M. Decker, 1974.
Lua MLA (9ú heag.)Virginia Polytechnic Institute and State University. Center for Environmental Studies, et al. The Environment: Costs, Conflicts, Action. M. Decker, 1974.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.