Purcell, Pelham Humfrey and Blow autograph MSS
MLA
Blow, John, d. 1708, Croft, William, 1678-1727, Humfrey, Pelham, 1647-1674, Purcell, Henry, 1659-1695. Purcell, Pelham Humfrey and Blow autograph MSS. [ca. 1680]. https://collections.library.yale.edu/catalog/2007125.
APA, 6th edition
Blow, John, d. 1708, & Croft, William, 1678-1727, & Humfrey, Pelham, 1647-1674, & Purcell, Henry, 1659-1695. ([ca. 1680])[Purcell, Pelham Humfrey and Blow autograph MSS]. https://collections.library.yale.edu/catalog/2007125.