Bourn, working goldsmith, engraver, and copper plate printer. At the Crown near the Gun Wharf Wall on the Common Hard, Portsmouth [graphic].
MLA
Bourn, Working Goldsmith, Engraver, and Copper Plate Printer. At the Crown near the Gun Wharf Wall on the Common Hard, Portsmouth [Graphic]. Bourn, 0AD. https://collections.library.yale.edu/catalog/16830714.
APA, 6th edition
Bourn, working goldsmith, engraver, and copper plate printer. At the Crown near the Gun Wharf Wall on the Common Hard, Portsmouth [graphic]. (0 C.E.). [Advertisements, Trade cards (advertising), Ephemera, Engravings England London 1757]. Bourn. https://collections.library.yale.edu/catalog/16830714.