Press, F., & Siever, R. (1974). Earth. W. H. Freeman.
Chicago Style aipamenaPress, Frank, and Raymond Siever. Earth. San Francisco: W. H. Freeman, 1974.
MLA aipamenaPress, Frank, and Raymond Siever. Earth. W. H. Freeman, 1974.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.