Ref Number: 1536 Lugt, Frits. Les marques de collections de dessins & d'estampes; marques estampillees et ecrites de collections. Amsterdam: Vereenigde drukkerijen, 1921.
1960
"Junius Spencer Morgan Is Dead; Banker Was Son of Financier." The New York Times (20 October 1960): 1, 35.