APA (7th ed.) Citation

Tolstoy, L., Maude, L. S., & Maude, A. (1952). War and peace. Encyclopaedia Britannica.

Chicago Style (17th ed.) Citation

Tolstoy, Leo, Louise Shanks Maude, and Aylmer Maude. War and Peace. Chicago: Encyclopaedia Britannica, 1952.

MLA (8th ed.) Citation

Tolstoy, Leo, et al. War and Peace. Encyclopaedia Britannica, 1952.