Não informado. (1972). Ambio: A journal of the human environment, research and management. Royal Swedish Academy of Sciences.
Lua i Stíl Chicago (17ú heag.)Não informado. Ambio: A Journal of the Human Environment, Research and Management. Stockholm: Royal Swedish Academy of Sciences, 1972.
Lua MLA (8ú heag.)Não informado. Ambio: A Journal of the Human Environment, Research and Management. Royal Swedish Academy of Sciences, 1972.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.