MLA

Boswell, James, 1740-1795. Malone's Shakespeare: manuscript pages and corrected page proofs from the 1821 edition. Box 176, folder 3107-11. n.d.. https://collections.library.yale.edu/catalog/10033892.

APA, 6th edition

Boswell, James, 1740-1795. (["Box 176, folder 3107-11"])(n.d.)[Malone's Shakespeare: manuscript pages and corrected page proofs from the 1821 edition]. https://collections.library.yale.edu/catalog/10033892.