MLA

Egan, Charles. A New Series of Instructions Arranged Expressly for the Royal Portable Irish Harp... (for the author by John Egan), 1822. https://collections.library.yale.edu/catalog/10267808.

APA, 6th edition

Egan, C. (1822). A New Series of Instructions Arranged Expressly for the Royal Portable Irish Harp... [Engravings (AAT), illustrations (AAT), instructions (document genre) (AAT), sheet music (AAT)]. (for the author by John Egan). https://collections.library.yale.edu/catalog/10267808.