LEET, L. D. (1982). Physical Geology / L. Don Leet. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)LEET, L. Don. Physical Geology / L. Don Leet. Prentice-Hall, 1982.
Lua MLA (8ú heag.)LEET, L. Don. Physical Geology / L. Don Leet. Prentice-Hall, 1982.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.