Sigismunda Tancred. [graphic]
MLA
Sigismunda Tancred. [Graphic]. Publish'd by T. Walker, No. 79 Dame Street, 0AD. https://collections.library.yale.edu/catalog/10731057.
APA, 6th edition
Sigismunda Tancred. [graphic]. (0 C.E.). [Portrait prints, Periodical illustrations, Engravings England London 1789, Stipple engravings England London 1789]. Publish'd by T. Walker, No. 79 Dame Street. https://collections.library.yale.edu/catalog/10731057.