Cite

Map of the County of Berks ... by C. & J. Greenwood. Engraved by J. Dower.

MLA

Map of the County of Berks ... by C. & J. Greenwood. Engraved by J. Dower. Greenwood & Co., 1829. https://collections.library.yale.edu/catalog/15309121.

APA, 6th edition

Map of the County of Berks ... by C. & J. Greenwood. Engraved by J. Dower. (1829). [Maps]. Greenwood & Co., https://collections.library.yale.edu/catalog/15309121.