MLA

Rowlandson, Thomas, 1756-1827. George III. Peter Pindar. Pegasus. Mount Parnassus.. Volume 3 | Folder III-14b. [n.d.]. https://collections.library.yale.edu/catalog/11791533.

APA, 6th edition

Rowlandson, Thomas, 1756-1827. (["Volume 3 | Folder III-14b"])([n.d.])[George III. Peter Pindar. Pegasus. Mount Parnassus.]. https://collections.library.yale.edu/catalog/11791533.