SKINNER, B. J. (1987). Physical Geology / Brian J. Skinner. John Wiley & Sons.
Lua i Stíl Chicago (17ú heag.)SKINNER, Brian J. Physical Geology / Brian J. Skinner. John Wiley & Sons, 1987.
Lua MLA (8ú heag.)SKINNER, Brian J. Physical Geology / Brian J. Skinner. John Wiley & Sons, 1987.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.