Sparling, E. (1930). Mystery men of Wall Street: The powers behind the market / by Earl Sparling (2. print.). Greenberg.

Sparling, Earl. Mystery Men of Wall Street: The Powers Behind the Market / by Earl Sparling. 2. print. New York: Greenberg, 1930.

Sparling, Earl. Mystery Men of Wall Street: The Powers Behind the Market / by Earl Sparling. 2. print. Greenberg, 1930.