Falk, D. V. (1958). Eugene O`Neill and the tragic tensión an interprise study of the plays. Rutgers University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रFalk, Doris V. Eugene O`Neill and the Tragic Tensión an Interprise Study of the Plays. New Yersey: Rutgers University Press, 1958.
एमएलए (9वां संस्करण) प्रशस्ति पत्रFalk, Doris V. Eugene O`Neill and the Tragic Tensión an Interprise Study of the Plays. Rutgers University Press, 1958.
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