Jenks, J. W., & Clark, W. E. (1917). The trust problem (4th ed.). Doubleday, Doran & Company.
Lua i Stíl Chicago (17ú heag.)Jenks, Jeremiah Whipple, agus Walter Ernest Clark. The Trust Problem. 4th ed. Garden City, N. Y.: Doubleday, Doran & Company, 1917.
Lua MLA (8ú heag.)Jenks, Jeremiah Whipple, agus Walter Ernest Clark. The Trust Problem. 4th ed. Doubleday, Doran & Company, 1917.
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