His Financial administration under the T'ang dynasty, 1970 t.p. (D.C. Twitchett)
The Cambridge history of China, 1978 t.p. (Denis Twitchett)
Cambridge history of China. Vol. 3, Sui and Tang China, 589-906. Part I. Chinese. Chien-chʻiao Chung-kuo Sui Tʻang shih ... 1990 t.p. (Tsʻui Jui-te, of U.K.) contents, etc. (prof. of Chinese, Cambridge Univ.; Denis Twitchett)
Jianqiao Zhongguo Liao Xi xia Jin Yuan shi, 907-1368 nian, 1998 t.p. (Denis Crispin Twitchett; Cui Ruide)
Times online WWW site, Mar. 15, 2006 (Professor Denis Twitchett; Denis Crispin Twitchett; b. Sept. 23, 1925; d. Feb. 24, 2006; scholar who, as the Cold War thawed, opened up for study 2,000 lost years in Chinese history)