MLA

Hulsberg, Henry, -1729, printmaker. Plan of the principal story of Houghton in Norfolk the seat of the Right Honourable Robert Walpole Esqr. ... Plan du principal etage de Houghton dans Norfolk maison Robert Walpole Esqr. &c. ; Plan of the attik [sic] story / [graphic] =. [1767?]. https://collections.library.yale.edu/catalog/16729645.

APA, 6th edition

Hulsberg, Henry, -1729, printmaker. ([1767?])[Plan of the principal story of Houghton in Norfolk the seat of the Right Honourable Robert Walpole Esqr. ... Plan du principal etage de Houghton dans Norfolk maison Robert Walpole Esqr. &c. ; Plan of the attik [sic] story / [graphic] =]. https://collections.library.yale.edu/catalog/16729645.