एपीए उद्धरण

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

शिकागो स्टाइल उद्धरण

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

एमएलए उद्धरण

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