Supple, Barry E. (1957). "A Business Elite: German-Jewish Financiers in Nineteenth-Century New York". Business History Review. 31 (2): 143–178. doi:10.2307/3111848. JSTOR3111848. S2CID145758162.
Supple, Barry E. (1957). "A Business Elite: German-Jewish Financiers in Nineteenth-Century New York". Business History Review. 31 (2): 143–178. doi:10.2307/3111848. JSTOR3111848. S2CID145758162.
Supple, Barry E. (1957). "A Business Elite: German-Jewish Financiers in Nineteenth-Century New York". Business History Review. 31 (2): 143–178. doi:10.2307/3111848. JSTOR3111848. S2CID145758162.