Shia And Sunni: What Caused The Split And How The Schism Developed

The Origins Of The Shiite Sunni Split

NPR

http://www.npr.org/sections/parallels/2007/02/12/7332087/the-origins-of-the-shiite-sunni-split

A Timeline Of The Shia-Sunni Split

NPR

http://www.npr.org/2007/02/12/7280905/chronology-a-history-of-the-shia-sunni-split