Hester, Heather. "Florenz Ziegfeld Jr.." (页面存档备份,存于互联网档案馆) In Immigrant Entrepreneurship: German-American Business Biographies, 1720 to the Present, vol. 4, edited by Jeffrey Fear. German Historical Institute. Last modified November 13, 2014.
Hester, Heather. "Florenz Ziegfeld Jr.." (页面存档备份,存于互联网档案馆) In Immigrant Entrepreneurship: German-American Business Biographies, 1720 to the Present, vol. 4, edited by Jeffrey Fear. German Historical Institute. Last modified November 13, 2014.