Gershwin, I., Wimmer, M., Gershwin, G., Heyward, D., & Heyward, D. (1999). Summertime: From Porgy and Bess. Simon & Schuster.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGershwin, Ira, Mike Wimmer, George Gershwin, DuBose Heyward, और Dorothy Heyward. Summertime: From Porgy and Bess. New York: Simon & Schuster, 1999.
एमएलए (8वां संस्करण) प्रशस्ति पत्रGershwin, Ira, et al. Summertime: From Porgy and Bess. Simon & Schuster, 1999.
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