Flint, R. F., & Skinner, B. J. (1974). Physical geology. Wiley.
Lua i Stíl Chicago (17ú heag.)Flint, Richard Foster, agus Brian J. Skinner. Physical Geology. New York: Wiley, 1974.
Lua MLA (9ú heag.)Flint, Richard Foster, agus Brian J. Skinner. Physical Geology. Wiley, 1974.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.