Sparling, E. (1930). Mystery men of Wall Street: The powers behind the market / by Earl Sparling (2. print.). Greenberg.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSparling, Earl. Mystery Men of Wall Street: The Powers Behind the Market / by Earl Sparling. 2. print. New York: Greenberg, 1930.
एमएलए (8वां संस्करण) प्रशस्ति पत्रSparling, Earl. Mystery Men of Wall Street: The Powers Behind the Market / by Earl Sparling. 2. print. Greenberg, 1930.
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