MLA

Carter, John, 1748-1817, artist. The crucifix under the shrine in the Chapel made of box inlaid with gold and mother of pearl. [art original]. [approximately 1790]. https://collections.library.yale.edu/catalog/16733122.

APA, 6th edition

Carter, John, 1748-1817, artist. ([approximately 1790])[The crucifix under the shrine in the Chapel made of box inlaid with gold and mother of pearl. [art original]]. https://collections.library.yale.edu/catalog/16733122.