George S. Hellman, Notes
on some original drawings of the old Masters by George S. Hellman, A.M., for a
portfolio of seventy-two reproductions of drawings selected from the collection
formed in 1811 by Joseph Green Cogswell and now in the possession of Mortimer
L. Schiff, 1786-1871, New York: privately published, 1915, no. 220; Meryvelma Smith O'Neil, "Giovanni Baglione. Seventeenth-century Artist, Draughtsman and Biographer of Artists.", Ph.D. Dissertation, St. Hilda's College, 1995, p. 264, no. 18;