Notable paintings: all from institutional or private owners, Vol. 1698
General Research Division, The New York Public Library. "A boy holding a pen " The New York Public Library Digital Collections. 1956. http://digitalcollections.nypl.org/items/aab4a1d0-d868-0135-c689-1b1d7f74d9c3
General Research Division, The New York Public Library. "A boy holding a pen " New York Public Library Digital Collections. Accessed April 22, 2019. http://digitalcollections.nypl.org/items/aab4a1d0-d868-0135-c689-1b1d7f74d9c3
General Research Division, The New York Public Library. (1956). A boy holding a pen Retrieved from http://digitalcollections.nypl.org/items/aab4a1d0-d868-0135-c689-1b1d7f74d9c3
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A boy holding a pen , (1956)
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|author=Digital Collections, The New York Public Library |accessdate=April 22, 2019 |publisher=The New York Public Library, Astor, Lennox, and Tilden Foundation}}</ref>
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