William Collins Sons and Co. (1980). The Collins world atlas (New rev. ed.). Collins.
Chicago Style aipamenaWilliam Collins Sons and Co. The Collins World Atlas. New rev. ed. Glasgow: Collins, 1980.
MLA aipamenaWilliam Collins Sons and Co. The Collins World Atlas. New rev. ed. Collins, 1980.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.