http://www.truthbeknown.com/first-christmas.html
http://www.firstchristmastree.us/
http://www.biblicalarchaeology.org/free-ebooks/the-first-christmas-the-story-of-jesus-birth-in-history-and-tradition/
http://www.history.com/topics/christmas
http://www.historyofchristmas.net/
http://www.simpletoremember.com/vitals/Christmas_TheRealStory.htm
http://www.thehistoryofchristmas.com/traditions.htm
http://www.allthingschristmas.com/traditions.html