Don Nardo 
Genghis Khan and the Mongol Empire [PDF ebook] 

Genghis Khan was a warrior and ruler of genius who, in the late twelfth and early thirteenth centuries, brought the nomadic tribes of Mongolia together under his rule and then turned his attention beyond his borders. This volume chronicles the history of the ancient people of the steppes, the rise of Genghis Khan and reforms under his rule, his conquests in northern China and Western Asia, and the history of the Mongol people after Genghis Khan.