MLA

Jefferys, Thomas, -1771. Africa [cartographic material] / drawn from the best maps by T. Jefferys, Geographer to his Royal Highness the Prince of Wales.. [1748]. https://collections.library.yale.edu/catalog/16372767.

APA, 6th edition

Jefferys, Thomas, -1771. ([1748])[Africa [cartographic material] / drawn from the best maps by T. Jefferys, Geographer to his Royal Highness the Prince of Wales.]. https://collections.library.yale.edu/catalog/16372767.