Beiser, A. (1989). The earth (2nd.). Times Life Books.
Chicago Style aipamenaBeiser, Arthur. The Earth. 2nd. Hongkong: Times Life Books, 1989.
MLA aipamenaBeiser, Arthur. The Earth. 2nd. Times Life Books, 1989.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.