Cite

Map of the county of Oxfordshire ... effected by the reform bill.

MLA

Map of the County of Oxfordshire ... Effected by the Reform Bill. J. Duncan, 0AD. https://collections.library.yale.edu/catalog/15309105.

APA, 6th edition

Map of the county of Oxfordshire ... effected by the reform bill. (0 C.E.). [Maps]. J. Duncan, https://collections.library.yale.edu/catalog/15309105.