Articles
The Christmas classic that almost wasn't - By Bill Nichols, USA TODAY, 2005 https://usatoday30.usatoday.com/life/television/news/2005-12-05-charlie-brown-christmas_x.htm
The Art and Making of Peanuts Animation: Celebrating Fifty Years of Television Specials - Charles Solomon, Chronicle Books, Jan 18, 2013 https://books.google.com/books?id=dz4E5mpwm6UC&authuser=0&num=11
Video
Charles Schulz on Charlie Rose, 1997 https://www.youtube.com/watch?v=pQBBt_PR9VE&t=1229s
A Boy Named Charlie Brown (1963) clips