p. 172: It is possible that I have underestimated the role of Li Yüan. I relied here mainly upon O. Franke and upon W. Bingham's The Founding of the T'ang Dynasty, Baltimore 1941.
p. 173: The best comprehensive study of T'ang economy in a Western language is still E. Balazs's work. I relied, however, strongly upon Wan Kuo-ting, Yang Chung-i, Kat[=o] Shigeru, J. Gernet, T. Naba, Niida Noboru, Yoshimi Matsumoto.
pp. 173-4: For the description of the administration I used my own studies and the work of R. des Rotours; for the military organization I used Kikuchi Hideo. A real study of Chinese army organization and strategy does not yet exist. The best detailed study, but for the Han period, is written by H. Maspero.
p. 174: For the first occurrence of the title tu-tu we used W. Eichhorn; in the form tutuq the title occurs since 646 in Central Asia (J. Hamilton).
p. 177: The name T'u-fan seems to be a transcription of Tüpöt which, in turn, became our Tibet. (J. Hamilton).—The Uighurs are the Hui-ho or Hui-hu of Chinese sources.
p. 179: On relations with Central Asia and the West see Ho Chien-min and Hsiang Ta, whose classical studies on Ch'ang-an city life have recently been strongly criticized by Chinese scholars.—Some authors (J.K. Rideout) point to the growing influence of eunuchs in this period.—The sources paint the pictures of the Empress Wu in very dark colours. A more detailed study of this period seems to be necessary.
p. 180: The best study of "family privileges" (yin) in general is by E.A. Kracke, Civil Service in Early Sung China, Cambridge, Mass. 1953.
p. 180-1: The economic importance of organized Buddhism has been studied by many authors, especially J. Gernet, Yang Lien-sheng, Ch'üan Han-sheng, K. Tamai and R. Michihata.
p. 182: The best comprehensive study on T'ang prose in English is still E.D. Edwards, Chinese Prose Literature of the T'ang Period, London 1937-8, 2 vol. On Li T'ai-po and Po Chü-i we have well-written books by A. Waley, The Poetry and Career of Li Po, London 1951 and The Life and Times of Po Chü-i, London 1950.—On the "free poem" (tz[)u]), which technically is not a free poem, see A. Hoffmann and Hu Shih. For the early Chinese theatre, the classical study is still Wang Kuo-wei's analysis, but there is an almost unbelievable number of studies constantly written in China and Japan, especially on the later theatre and drama.
p. 184: Conditions at the court of Hsüan Tsung and the life of Yang Kui-fei have been studied by Howard Levy and others, An Lu-shan's importance mainly by E.G. Pulleyblank, The Background of the Rebellion of An Lu-shan, London 1955.