Felix, Antonia. Christmas in America. Courage Books. 1999 [2017-01-27]. ISBN 9780762405947（英語）. German families brought a small tree into the home at Christmas time as a symbol of the Christ child, and decorated the boughs with cutout paper flowers, bright foil, apples, sweets, and other fancy treats. Another feature of Christmas that took a uniquely American turn in the nineteenth century is the tradition of Christmas lights. Candles were traditionally placed on the Christmas tree to symbolize Jesus as the light of the world.
