Cite

A new edition (being the second) of An introduction to harmony

MLA

Shield, William, 1748-1829. A new edition (being the second) of An introduction to harmony. Box 718. [1815]. https://collections.library.yale.edu/catalog/10000238.

APA, 6th edition

Shield, William, 1748-1829. (["Box 718"])([1815])[A new edition (being the second) of An introduction to harmony]. https://collections.library.yale.edu/catalog/10000238.