APA aipamena

(1972). Focus on earth science. Columbus, Ohio: Charles E. Merrill Pub.

Chicago Style aipamena

Focus On Earth Science. Columbus, Ohio: Charles E. Merrill Pub, 1972.

MLA aipamena

Focus On Earth Science. Columbus, Ohio: Charles E. Merrill Pub, 1972.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.