MLA

Pomfret, Henrietta Louisa Jeffreys Fermor, Countess of, 1700?-1761. Pedigree showing descent of Lord and Lady Pomfret from King Edward I, circa 1750. https://collections.library.yale.edu/catalog/15948822.

APA, 6th edition

Pomfret, Henrietta Louisa Jeffreys Fermor, Countess of, 1700?-1761. [Pedigree showing descent of Lord and Lady Pomfret from King Edward I, circa 1750]. https://collections.library.yale.edu/catalog/15948822.