Crawford, R. (2019). Summertime: George Gershwin's life in music (First edition.). W.W. Norton & Company.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCrawford, Richard. Summertime: George Gershwin's Life in Music. First edition. New York: W.W. Norton & Company, 2019.
एमएलए (8वां संस्करण) प्रशस्ति पत्रCrawford, Richard. Summertime: George Gershwin's Life in Music. First edition. W.W. Norton & Company, 2019.
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