MLA

Montagu, Charles, Duke of Manchester, 1660?-1722. The Earl of Jersey to the E of M, giving instructions on various subjects. (Partly in cipher, deciphered. Printed, as deciphered, in Cole's Memoirs, p. 101) Whitehall. Box 3, folder 9. 1699/1700 Feb 1. https://collections.library.yale.edu/catalog/16601193.

APA, 6th edition

Montagu, Charles, Duke of Manchester, 1660?-1722. (["Box 3, folder 9"])(1699/1700 Feb 1)[The Earl of Jersey to the E of M, giving instructions on various subjects. (Partly in cipher, deciphered. Printed, as deciphered, in Cole's Memoirs, p. 101) Whitehall]. https://collections.library.yale.edu/catalog/16601193.