MLA

Purcell, Joseph (Cartographer). A map of the states of Virginia, North Carolina, South Carolina and Georgia [cartographic material] : comprehending the Spanish provinces of East and West Florida, exhibiting the boundaries as fixed by the late treaty of peace between the United States an. 1788. https://collections.library.yale.edu/catalog/16388932.

APA, 6th edition

Purcell, Joseph (Cartographer). (1788)[A map of the states of Virginia, North Carolina, South Carolina and Georgia [cartographic material] : comprehending the Spanish provinces of East and West Florida, exhibiting the boundaries as fixed by the late treaty of peace between the United States an]. https://collections.library.yale.edu/catalog/16388932.