APA (7th ed.) Citation

(1981). Webster's third new international dictionary: Of the english language. Encyclopaedia Britannica.

Chicago Style (17th ed.) Citation

Webster's Third New International Dictionary: Of the English Language. Chicago [u.a.]: Encyclopaedia Britannica, 1981.

MLA (9th ed.) Citation

Webster's Third New International Dictionary: Of the English Language. Encyclopaedia Britannica, 1981.