"The Empire of the Qara Khitai in Eurasian History: Between China and the Islamic World", ISBN 0-521-84226-3* Wei Shu 魏史 (Dynastic History of the Northern Wei Dynasty): Wei, Shou 魏收 et al.
"The Empire of the Qara Khitai in Eurasian History: Between China and the Islamic World", ISBN 0-521-84226-3;Useful official dynastic histories* Wei Shu 魏史 (Dynastic History of the Northern Wei Dynasty): Wei, Shou 魏收 et al.