APA (7th ed.) Citation

(1976). 6,000 words: A supplement to Webster's third new international dictionary. G. & C. Merriam.

Chicago Style (17th ed.) Citation

6,000 Words: A Supplement to Webster's Third New International Dictionary. Springfield, MA: G. & C. Merriam, 1976.

MLA (9th ed.) Citation

6,000 Words: A Supplement to Webster's Third New International Dictionary. G. & C. Merriam, 1976.