APA (7th ed.) Citation

Encyclopaedia Britannica, inc, Timmons, C., & Gibney, F. (1980). Britannica book of English usage. Doubleday/Britannica Books.

Chicago Style (17th ed.) Citation

Encyclopaedia Britannica, inc, Christine Timmons, and Frank Gibney. Britannica Book of English Usage. Garden City, N.Y.: Doubleday/Britannica Books, 1980.

MLA (9th ed.) Citation

Encyclopaedia Britannica, inc, et al. Britannica Book of English Usage. Doubleday/Britannica Books, 1980.