Tapper, Nancy (1991). Bartered Brides: Politics, Gender and Marriage in an Afghan Tribal Society. United States: Cambridge University Press. p. 331. ISBN0-521-38158-4. "Despite fiercely pro-Pashtun sentiments, Muhammad Gul Khan refused to countenance the oppression perpetuated by the Khans. He balanced the domination of Durrani from Kandahar by introducing many more eastern Pashtuns to the area (especially as landowners between Aqcha and Balkh), and he appears to have dealt fairly with petitions against the Nazarzai brought by Uzbeks and Aymaks from throughout the Saripul region and its hinterland." p. 34
