Cite

[A white plaster reverse portrait medallion depicting Sir Robert Walpole] [realia].

MLA

[A White Plaster Reverse Portrait Medallion Depicting Sir Robert Walpole] [Realia]. 0AD. https://collections.library.yale.edu/catalog/15815181.

APA, 6th edition

[A white plaster reverse portrait medallion depicting Sir Robert Walpole] [realia]. (0 C.E.). [Portraits]. https://collections.library.yale.edu/catalog/15815181.