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DJVU PDF Cook, R.S. and Lowe, J.B. 2000, "The Sino-Tibetan Etymological Dictionary and Thesaurus: STEDT Project Data Resources and Protocols", in The 33rd International Conference on Sino-Tibentan Languages and Linguistics, Bangkok, Thailand, pp. 378-396. Ramkhamhaeng University. cite.

Cook, R.S. 1995, "The etymology of Chinese Chén", in Linguistics of the Tibeto-Burman Area, vol. 18, no. 2, pp. 1-232. cite.