MLA

Jefferys, Thomas, -1771. Martinico, one of the Caribbee Islands in the West Indies subject to the French / [cartographic material]. [1768]. https://collections.library.yale.edu/catalog/10563626.

APA, 6th edition

Jefferys, Thomas, -1771. ([1768])[Martinico, one of the Caribbee Islands in the West Indies subject to the French / [cartographic material]]. https://collections.library.yale.edu/catalog/10563626.