Penn Warren, R. The patented gate and the mean Hamburger: Robert Penn Warren. The South.(1979).
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPenn Warren, Robert. "The Patented Gate and the Mean Hamburger: Robert Penn Warren." The South.(1979) .
एमएलए (8वां संस्करण) प्रशस्ति पत्रPenn Warren, Robert. "The Patented Gate and the Mean Hamburger: Robert Penn Warren." The South.(1979), .
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