MLA

Smith, J., and printmaker. Maria Countess of Waldegrave & Her Daughter Lady Elizth. Laura [Graphic]. Printed for Robt. Sayer, at No. 53 in Fleet Street, 0AD. https://collections.library.yale.edu/catalog/16194819.

APA, 6th edition

Smith, J., & printmaker. (0 C.E.). Maria Countess of Waldegrave & her daughter Lady Elizth. Laura [graphic] [Portrait prints, Mezzotints England London 1760]. Printed for Robt. Sayer, at No. 53 in Fleet Street. https://collections.library.yale.edu/catalog/16194819.