De Blij, H. J., & Muller, P. O. (1993). Physical geography of the global environment. Wiley.
Lua i Stíl Chicago (17ú heag.)De Blij, Harm J., agus Peter O. Muller. Physical Geography of the Global Environment. New York: Wiley, 1993.
Lua MLA (8ú heag.)De Blij, Harm J., agus Peter O. Muller. Physical Geography of the Global Environment. Wiley, 1993.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.