Gaya APA

Ragan, D, M. (2009). Structural Geology An Introduction To Geometrical Techniques (4th ed.). United States of America: Cambridge Universty Press.

Gaya MLA

Ragan, Donal, M.. "Structural Geology An Introduction To Geometrical Techniques". 4th ed. United States of America: Cambridge Universty Press, 2009. Text.