MLA

Jefferys, Thomas, -1771. A new map of Nova Scotia, and Cape Britain. With the adjacent parts of New England and Canada, composed from a great number of actual surveys; and other materials regulated by many new astronomical observations of the longitude as well as latitude; with an explanation. 1755.. https://collections.library.yale.edu/catalog/2040299.

APA, 6th edition

Jefferys, Thomas, -1771. (1755.)[A new map of Nova Scotia, and Cape Britain. With the adjacent parts of New England and Canada, composed from a great number of actual surveys; and other materials regulated by many new astronomical observations of the longitude as well as latitude; with an explanation]. https://collections.library.yale.edu/catalog/2040299.