APA (7th ed.) Citation

Zeleny, R. O. (1991). The World Book Health & Medical Annual. World book Inc.

Chicago Style (17th ed.) Citation

Zeleny, Robert O. The World Book Health & Medical Annual. Chicago: World book Inc, 1991.

MLA (9th ed.) Citation

Zeleny, Robert O. The World Book Health & Medical Annual. World book Inc, 1991.

Warning: These citations may not always be 100% accurate.