@book{1836,
	author = {Siddiqi, Amir Hasan and Siddiqi, Amir Hasan},
	title = {Caliphate and Kingship in Medieval Persia},
	publisher = {Sh. Muhammad Ashraf},
	year = {1942},
	address = {Lahore},
	note = {includes index and biblioraphy}
}