
As given in Rashid al-Din's Compendium of Chronicles (Jami' al-tawarikh) ( https://en.wikipedia.org/wiki/Jami%27_al-tawarikh) (Can find a translated version on google books: http://books.google.com/books?id=d2SWstj6j3AC&lpg=PA142&ots=8Tn8g77BgR&dq=genghis%20khan%20and%20drinking&pg=PA142#v=onepage&q=genghis%20khan%20and%20drinking&f=false)