There are plenty of other sources, a simple internet search would show it. Many historians and academics also doubt the existence of Jesus, appearing in peer reviewed academic papers:

• http://www.dailymail.co.uk/sciencetech/article-2776194/Jesus-never-existed-Writer-finds-no-mention-Christ-126-historical-texts-says-mythical-character.html
• http://www.nobeliefs.com/exist.htm