Tietjen, M. L. (1976). The Bethlehem tree: A family Advent resource book. Paulist Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रTietjen, Mary Louise. The Bethlehem Tree: A Family Advent Resource Book. New York: Paulist Press, 1976.
एमएलए (8वां संस्करण) प्रशस्ति पत्रTietjen, Mary Louise. The Bethlehem Tree: A Family Advent Resource Book. Paulist Press, 1976.
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