MLA

Zoelcke, Carl Heinrich, and playing card maker. Extra Feine Schwerdter Karte. Carl Heinrich Zoelcke, 1845. https://collections.library.yale.edu/catalog/10933640.

APA, 6th edition

Zoelcke, C. H., & playing card maker. (1845). Extra feine Schwerdter Karte [Specimens, Playing cards]. Carl Heinrich Zoelcke. https://collections.library.yale.edu/catalog/10933640.