There are no special works devoted to the history of Pakistan as a whole, neither in Western European, nor in American, nor in Indian, nor in Pakistani historiography. The main sources for writing sections of the book on the history of Pakistan proper were official Pakistani documentation, statements by major politicians and the press. The authors relied on the Marxist-Leninist theory of national and agrarian issues and the role of religion in the social development of peoples, as well as on the assessments of the national bourgeoisie and the features of the national liberation movement of peoples at the present stage contained in the documents of the international communist movement.