p. [125]: For the description of conditions in Turkestan, especially in Tunhuang, I rely upon my own studies, but studies by A. von Gabein, L. Ligeti, J. R. Ware, O. Franke and Tsukamoto Zenryû have been used, too.
p. [133]: These songs have first been studied by Hu Shih, later by Chinese folklorists.
p. [134]: For problems of Chinese Buddhism see Arthur F. Wright, Buddhism in Chinese History, Stanford 1959, with further bibliography. I have used for this and later periods, in addition to my own sociological studies, R. Michihata, J. Gernet, and Tamai Korehiro.—It is interesting that the rise of land-owning temples in India occurred at exactly the same time (R. S. Sharma in Journ. Econ. and Soc. Hist. Orient, vol. 1, 1958, p. 316). Perhaps even more interesting, but still unstudied, is the existence of Buddhist temples in India which owned land and villages which were donated by contributions from China.—For the use of foreign monks in Chinese bureaucracies, I have used M. Weber's theory as an interpretative tool.
p. 135: The important deities of Khotan Buddhism are Vaišramana and Kubera, (research by P. Demiéville, R. Stein and others).—Where, how, and why Hinayana and Mahayana developed as separate sects, is not yet studied. Also, a sociological analysis of the different Buddhist sects in China has not even been attempted yet.
p. [136]: Such public religious disputations were known also in India.
p. [137]: Analysis of the tribal names has been made by L. Bazin.
p. [138]-9: The personality type which was the ideal of the Toba corresponded closely to the type described by G. Geesemann, Heroische Lebensform, Berlin 1943.
p. [142]: The Toba occur in contemporary Western sources as Tabar, Tabgaç, Tafkaç and similar names. The ethnic name also occurs as a title (O. Pritsak, P. Pelliot, W. Haussig and others).—On the chün-t'ien system cf. the article by Wan Kuo-ting in E-tu Zen Sun, Chinese Social History, Washington 1956, p. 157-184. I also used Yoshimi Matsumoto and T'ang Ch'ang-ju.—Census fragments from Tunhuang have been published by L. Giles, Niida Noboru and other Japanese scholars.
p. [143]: On slaves for the earlier time see M. Wilbur, Slavery in China during the Former Han Dynasty, Chicago 1943. For our period Wang Yi-t'ung and especially Niida Noboru and Ch'ü T'ung-tsu. I used for this discussion Niida, Ch'ü and Tamai Korehiro.—For the pu-ch'ü I used in addition Yang Chung-i, H. Maspero, E. Balazs, W. Eichhorn. Yang's article is translated in E-tu Zen Sun's book, Chinese Social History, pp. 142-56.—The question of slaves and their importance in Chinese society has always been given much attention by Chinese Communist authors. I believe that a clear distinction between slaves and serfs is very important.