MLA

Britannia Romana. [A. Swalle & A. & J. Churchill], , 0AD. https://collections.library.yale.edu/catalog/15259715.

APA, 6th edition

Britannia Romana. (0 C.E.). [Maps]. [A. Swalle & A. & J. Churchill], . https://collections.library.yale.edu/catalog/15259715.