Beckford, J. A. (1975). Trumpet of prophecy: A sociological study of Jehovah's witnesses. Basil Blackwell.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBeckford, James A. Trumpet of Prophecy: A Sociological Study of Jehovah's Witnesses. Basil Blackwell, 1975.
एमएलए (9वां संस्करण) प्रशस्ति पत्रBeckford, James A. Trumpet of Prophecy: A Sociological Study of Jehovah's Witnesses. Basil Blackwell, 1975.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.