Cite

A Set of Grand Lessons for the Harpsichord or Piano-Forte.... Print (London: author)

MLA

Ernest Augustus, King of Hanover, 1771-1851. A Set of Grand Lessons for the Harpsichord or Piano-Forte.... Print (London: author). Box 683. undated. https://collections.library.yale.edu/catalog/11237293.

APA, 6th edition

Ernest Augustus, King of Hanover, 1771-1851. (["Box 683"])(undated)[A Set of Grand Lessons for the Harpsichord or Piano-Forte.... Print (London: author)]. https://collections.library.yale.edu/catalog/11237293.