[Engraved publisher's advertisement with fabric swatches]
MLA
Ackermann, Rudolph, 1764-1834. [Engraved publisher's advertisement with fabric swatches]. 1809 November. https://collections.library.yale.edu/catalog/2057110.
APA, 6th edition
Ackermann, Rudolph, 1764-1834. (1809 November)[[Engraved publisher's advertisement with fabric swatches]]. https://collections.library.yale.edu/catalog/2057110.