Heffner, R. D. (1956). A documentary History of the united states. The New American Library.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHeffner, Richard D. A Documentary History of the United States. New York: The New American Library, 1956.
एमएलए (9वां संस्करण) प्रशस्ति पत्रHeffner, Richard D. A Documentary History of the United States. The New American Library, 1956.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.