MLA

Montagu, Charles, Duke of Manchester, 1660?-1722. R. Yard to the E of M, announcing the Spanish Ambassador's speedy departure, and the non-appearance of persons expected at Dover. (Partly in cipher, deciphered. Printed, as deciphered, in Cole's Memoirs, p. 61) Whitehall. Box 2, folder 45. 1699 Oct 5. https://collections.library.yale.edu/catalog/16601172.

APA, 6th edition

Montagu, Charles, Duke of Manchester, 1660?-1722. (["Box 2, folder 45"])(1699 Oct 5)[R. Yard to the E of M, announcing the Spanish Ambassador's speedy departure, and the non-appearance of persons expected at Dover. (Partly in cipher, deciphered. Printed, as deciphered, in Cole's Memoirs, p. 61) Whitehall]. https://collections.library.yale.edu/catalog/16601172.