. eb.com, Encyclopædia Britannica . Chicago: Encyclopædia Britannica, Inc.. 2006 . http://www.britannica.com/eb/article-9110518/Asia .   ^ National Geographic Atlas of the World (7th ed.). Washington, DC: National Geographic . 1999. ISBN   978-0-7922-7528-2 .   "Europe" (pp. 68–9); "Asia" (pp. 90–1): "A commonly accepted division between Asia and Europe is formed by the