MLA

Walker, J. G., and printmaker. Coins of William & Mary [Graphic]. Pubd. by R. Bowyer, Pall Mall, 1AD. https://collections.library.yale.edu/catalog/16816660.

APA, 6th edition

Walker, J. G., & printmaker. (1 C.E.). Coins of William & Mary [graphic] [Engravings England London 1805]. Pubd. by R. Bowyer, Pall Mall. https://collections.library.yale.edu/catalog/16816660.