Cita APA

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

Chicago Style Citation

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

Cita MLA

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

Atenció: Aquestes cites poden no estar 100% correctes.