Billings, M. P. (1965). Structural geology (2a. ed.). Prentice-Hall.
Chicago Style (17th ed.) ZitazioaBillings, Marland P. Structural Geology. 2a. ed. Englewood Cliffs: Prentice-Hall, 1965.
MLA (9th ed.) ZitazioaBillings, Marland P. Structural Geology. 2a. ed. Prentice-Hall, 1965.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.