APA (7th ed.) Citation

The new encyclopaedia Britannica: Knowledge in depth (15. ed.). Encyclopaedia Britannica [u.a.].

Chicago Style (17th ed.) Citation

The New Encyclopaedia Britannica: Knowledge in Depth. 15. ed. Chicago, Ill. [u.a.]: Encyclopaedia Britannica [u.a.].

MLA (9th ed.) Citation

The New Encyclopaedia Britannica: Knowledge in Depth. 15. ed. Encyclopaedia Britannica [u.a.].