MLA

Bonnor, Thomas. [Baptismal Font] [Graphic]. Publish'd according to act of Parliament January 1st, 1782, by Ralph Bigland, Garter principal King of Arms, 0AD. https://collections.library.yale.edu/catalog/16194614.

APA, 6th edition

Bonnor, T. (0 C.E.). [Baptismal font] [graphic] [Engravings England London 1782]. Publish'd according to act of Parliament January 1st, 1782, by Ralph Bigland, Garter principal King of Arms. https://collections.library.yale.edu/catalog/16194614.