APA (7th ed.) Citation

(1952). The thirteen books of Euclid's elements. Encyclopaedia Britannica.

Chicago Style (17th ed.) Citation

The Thirteen Books of Euclid's Elements. Chicago: Encyclopaedia Britannica, 1952.

MLA (9th ed.) Citation

The Thirteen Books of Euclid's Elements. Encyclopaedia Britannica, 1952.