^Milton, Ralph (2000). This United Church of Ours (in English). Wood Lake Publishing Inc. p. 87. ISBN9781551453897. Retrieved 9 April 2014. "Many congregations have a special week or so before Christmas. Some call it "Blue Christmas," while others call it, "The Longest Night," and some simply call it a "Service of Remembering.""
^Quivik, Melinda A. (2005). A Christian Funeral: Witness to the Resurrection (in English). Augsburg Books. p. 90. ISBN9780806651484. Retrieved 9 April 2014. "an Advent evening eucharist (called Longest Night or Blue Christmas) that recognizes how hard the coming of Christmas can be for those who have buried a loved one during the past year."