Twain, M., Clemens, S. L., & Anderson, F. (1979). A pen warmed-up in hell: Mark Twain in protest. Harper & Row, Publishers, Inc.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रTwain, Mark, Samuel Langhorne Clemens, और Frederick Anderson. A Pen Warmed-up in Hell: Mark Twain in Protest. New York, N.Y: Harper & Row, Publishers, Inc, 1979.
एमएलए (9वां संस्करण) प्रशस्ति पत्रTwain, Mark, et al. A Pen Warmed-up in Hell: Mark Twain in Protest. Harper & Row, Publishers, Inc, 1979.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.