APA (7th ed.) Citation

The World Publishing Company. (1966). Webster's new world dictionary: Of the american language (First edition.). The World Publishing Company.

Chicago Style (17th ed.) Citation

The World Publishing Company. Webster's New World Dictionary: Of the American Language. First edition. Cleveland: The World Publishing Company, 1966.

MLA (8th ed.) Citation

The World Publishing Company. Webster's New World Dictionary: Of the American Language. First edition. The World Publishing Company, 1966.