MLA

Jefferys, Thomas, -1771, cartographer. 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 situation adjusted by astronomical observations. [1755 or 1759?]. https://collections.library.yale.edu/catalog/2040287.

APA, 6th edition

Jefferys, Thomas, -1771, cartographer. ([1755 or 1759?])[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 situation adjusted by astronomical observations]. https://collections.library.yale.edu/catalog/2040287.