DIXON, D. Encyclopedi of science: The earth. Volume III. Macmillan.
Lua i Stíl Chicago (17ú heag.)DIXON, Dougal. Encyclopedi of Science: The Earth. Volume III. Macmillan.
Lua MLA (8ú heag.)DIXON, Dougal. Encyclopedi of Science: The Earth. Volume III. Macmillan.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.