MLA

Westerman, active 1757, printmaker. [Arms with three downward-facing arrows, within floral cartouche] [graphic]. [approximately 1757]. https://collections.library.yale.edu/catalog/16830974.

APA, 6th edition

Westerman, active 1757, printmaker. ([approximately 1757])[[Arms with three downward-facing arrows, within floral cartouche] [graphic]]. https://collections.library.yale.edu/catalog/16830974.