Penn Warren, R. The patented gate and the mean Hamburger: Robert Penn Warren. The South.(1979).
Chicago-Zitierstil (17. Ausg.)Penn Warren, Robert. "The Patented Gate and the Mean Hamburger: Robert Penn Warren." The South.(1979) .
MLA-Zitierstil (8. Ausg.)Penn Warren, Robert. "The Patented Gate and the Mean Hamburger: Robert Penn Warren." The South.(1979), .
警告：这些引文格式不一定是100％准确.