APA (7th ed.) Citation

(1974). Encyclopedia Britannica volumes 09. Helen Hemingway Benton Publisher.

Chicago Style (17th ed.) Citation

Encyclopedia Britannica Volumes 09. u.s.a: Helen Hemingway Benton Publisher, 1974.

MLA (9th ed.) Citation

Encyclopedia Britannica Volumes 09. Helen Hemingway Benton Publisher, 1974.

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