MLA

Hopkins, Brazier & Ironmonger to His Majesty, at His Stove-Grate Warehouse, the Corner of Greek Street, Soho, London [Graphic]. William Hopkins, 0AD. https://collections.library.yale.edu/catalog/16929060.

APA, 6th edition

Hopkins, brazier & ironmonger to his Majesty, at his stove-grate warehouse, the corner of Greek Street, Soho, London [graphic]. (0 C.E.). [Advertisements, Trade cards (advertising), Ephemera, Etchings England London 1790, Engravings England London 1790]. William Hopkins. https://collections.library.yale.edu/catalog/16929060.