International Union for Conservation of Nature and Natural Resources & Saveland, R. N. (1976). Handbook of environmental education, with international case studies. J. Wiley.
Lua i Stíl Chicago (17ú heag.)International Union for Conservation of Nature and Natural Resources agus Robert N. Saveland. Handbook of Environmental Education, with International Case Studies. London, New York: J. Wiley, 1976.
Lua MLA (9ú heag.)International Union for Conservation of Nature and Natural Resources agus Robert N. Saveland. Handbook of Environmental Education, with International Case Studies. J. Wiley, 1976.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.