Armstrong, H. W. (1985). Mystery of the ages. Worldwide Church of God.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रArmstrong, Herbert W. Mystery of the Ages. Pasadena, Calif: Worldwide Church of God, 1985.
एमएलए (9वां संस्करण) प्रशस्ति पत्रArmstrong, Herbert W. Mystery of the Ages. Worldwide Church of God, 1985.
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