Wikipedia: Khazars.
Khazaria, A hidden & forbidden Jewish history exposed
The Thirteenth Tribe by Arthur Koestler
NYTimes: Geneticists Report Finding Central Asian Link to Ashkenazi Levite
NY Times: Studies Show Jews' Genetic Similarity
In DNA, New Clues to Jewish Roots by the NY Times
Ukraine & The Khazar Empire By the Jewish Virtual Library
Zionist FAQ: The Land of Israel was promised to the descendents of Isaac by God
Electronic Intifada: Israel's surprising best seller contradicts founding ideology
Ha'aretz: An invention called 'the Jewish people'
Khazri-Fiction: A Yahoo e-group that is for people interested in reading, writing, publishing, or distributing historical fiction novels and short stories about the Khazar Khaganate as well as other topics in Jewish, Slavic, and Turkic history
Ha'aretz: Shattering a 'national mythology' By Ofri Ilani
Associated Press: Scholar claims to find medieval Jewish capital