MLA

G. W., et al. Colton's New Jersey [Cartographic Material]. G.W. and C.B. Colton, 1866. https://collections.library.yale.edu/catalog/15790100.

APA, 6th edition

G. W., Colton, C. B., & C. (1866). Colton's New Jersey [cartographic material]. [Maps]. G.W. and C.B. Colton, https://collections.library.yale.edu/catalog/15790100.