APA (7th ed.) Citation

Zeleny, R. O. (1964). The World book encyclopedia. Field Enterprises Educational.

Chicago Style (17th ed.) Citation

Zeleny, Robert O. The World Book Encyclopedia. Chicago, Ill: Field Enterprises Educational, 1964.

MLA (9th ed.) Citation

Zeleny, Robert O. The World Book Encyclopedia. Field Enterprises Educational, 1964.

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