MLA

Jefferys, Thomas, d. 1771, creator, Mellon, Paul. A map of the most inhabited part of New England: containing the provinces of Massachusets Bay and New Hampshire, with the colonies of Conecticut and Rhode Island : divided into counties and townships : the whole composed from actual surveys and its situat. November 29th 1755. https://collections.library.yale.edu/catalog/2040287.

APA, 6th edition

Jefferys, Thomas, d. 1771, creator, & Mellon, Paul. (November 29th 1755)[A map of the most inhabited part of New England: containing the provinces of Massachusets Bay and New Hampshire, with the colonies of Conecticut and Rhode Island : divided into counties and townships : the whole composed from actual surveys and its situat]. https://collections.library.yale.edu/catalog/2040287.