Steel buttons Coup de bouton / [graphic] =
MLA
Humphrey, William, approximately 1740-approximately 1810, printmaker. Steel buttons Coup de bouton / [graphic] =. [29 April 1777]. https://collections.library.yale.edu/catalog/10723103.
APA, 6th edition
Humphrey, William, approximately 1740-approximately 1810, printmaker. ([29 April 1777])[Steel buttons Coup de bouton / [graphic] =]. https://collections.library.yale.edu/catalog/10723103.