Beaver, S., & Derbyshire, E. (1974). Structural geomorphology. Longman.
Chicago Style aipamenaBeaver, S.H, and E. Derbyshire. Structural Geomorphology. London: Longman, 1974.
MLA aipamenaBeaver, S.H, and E. Derbyshire. Structural Geomorphology. Longman, 1974.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.