MLA

Smith, J. (John), active approximately 1750-1792, attributed name. Maria Countess of Waldegrave & her daughter Lady Elizth. Laura. [approximately 1761]. https://collections.library.yale.edu/catalog/16194819.

APA, 6th edition

Smith, J. (John), active approximately 1750-1792, attributed name. ([approximately 1761])[Maria Countess of Waldegrave & her daughter Lady Elizth. Laura]. https://collections.library.yale.edu/catalog/16194819.