Mass, J. P. (1999). Yoritomo and the founding of the first Bakufu: The origins of dual government in Japan. Stanford University Press.

Mass, Jeffrey P. Yoritomo and the Founding of the First Bakufu: The Origins of Dual Government in Japan. Stanford, CA: Stanford University Press, 1999.

Mass, Jeffrey P. Yoritomo and the Founding of the First Bakufu: The Origins of Dual Government in Japan. Stanford University Press, 1999.