APA (7th ed.) Citation
(1989). Webster's Encyclopedic Unabridged Dictionary of the English Language. Portland House.
Chicago Style (17th ed.) Citation
Webster's Encyclopedic Unabridged Dictionary of the English Language. New York: Portland House, 1989.
MLA (9th ed.) Citation
Webster's Encyclopedic Unabridged Dictionary of the English Language. Portland House, 1989.
Warning: These citations may not always be 100% accurate.