APA (7th ed.) Citation

(1768). The new encyclopedia britannica: Index (L - Z) (15th. ed.). The University of Chicago.

Chicago Style (17th ed.) Citation

The New Encyclopedia Britannica: Index (L - Z). 15th. ed. Chicago: The University of Chicago, 1768.

MLA (9th ed.) Citation

The New Encyclopedia Britannica: Index (L - Z). 15th. ed. The University of Chicago, 1768.