Ragan, D. M. (1973). Structural geology: An introduction to geometrical techniques (2nd ed.). John Wiley & Sons.
Lua i Stíl Chicago (17ú heag.)Ragan, Donal M. Structural Geology: An Introduction to Geometrical Techniques. 2nd ed. New York: John Wiley & Sons, 1973.
Lua MLA (9ú heag.)Ragan, Donal M. Structural Geology: An Introduction to Geometrical Techniques. 2nd ed. John Wiley & Sons, 1973.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.