Autograph manuscript letter, signed, from William Blake to an unidentified recipient
MLA
Blake, William, 1757-1827. Autograph manuscript letter, signed, from William Blake to an unidentified recipient. Box 1, folder 7. undated. https://collections.library.yale.edu/catalog/32498507.
APA, 6th edition
Blake, William, 1757-1827. (["Box 1, folder 7"])(undated)[Autograph manuscript letter, signed, from William Blake to an unidentified recipient]. https://collections.library.yale.edu/catalog/32498507.