Cite

The county of Buckingham, surveyed in MDCCLXVI, VII, and VIII and engraved by Thomas Jefferys ... MDCCLXX.

MLA

The County of Buckingham, Surveyed in MDCCLXVI, VII, and VIII and Engraved by Thomas Jefferys ... MDCCLXX. A. Dury, 1770. https://collections.library.yale.edu/catalog/15309148.

APA, 6th edition

The county of Buckingham, surveyed in MDCCLXVI, VII, and VIII and engraved by Thomas Jefferys ... MDCCLXX. (1770). [Maps]. A. Dury, https://collections.library.yale.edu/catalog/15309148.