Penn Warren, R. The patented gate and the mean Hamburger: Robert Penn Warren. The South.(1979).
Lua i Stíl Chicago (17ú heag.)Penn Warren, Robert. "The Patented Gate and the Mean Hamburger: Robert Penn Warren." The South.(1979) .
Lua MLA (8ú heag.)Penn Warren, Robert. "The Patented Gate and the Mean Hamburger: Robert Penn Warren." The South.(1979), .
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