Leet, L. D., & Judson, S. (1958). Physical geology (2nd ed.). Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Leet, L. Don, agus Sheldon Judson. Physical Geology. 2nd ed. New Jersey: Prentice Hall, 1958.
Lua MLA (9ú heag.)Leet, L. Don, agus Sheldon Judson. Physical Geology. 2nd ed. Prentice Hall, 1958.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.