MLA

Gray, O. W., and Son. Gray's New Map of Hampton : Elizabeth City County, Va. : Drawn from Special Surveys. Drawn, engraved, and published by O. W. Gray & Son, 1878. https://collections.library.yale.edu/catalog/15811269.

APA, 6th edition

Gray, O. W., & S. (1878). Gray's new map of Hampton : Elizabeth City County, Va. : drawn from special surveys. [Maps]. Drawn, engraved, and published by O. W. Gray & Son, https://collections.library.yale.edu/catalog/15811269.