Readers Digest Asso. (1980). Natural wonders of the world. RDA.
Lua i Stíl Chicago (17ú heag.)Readers Digest Asso. Natural Wonders of the World. New York: RDA, 1980.
Lua MLA (9ú heag.)Readers Digest Asso. Natural Wonders of the World. RDA, 1980.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.