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Atlas of the World’s Languages in Danger . Christopher Moseley (ed.) (2010) · UNESCO Publishing http://www.unesco.org/culture/en/endangeredlanguages/atlas

What are we trying to preserve? Diversity, change, and ideology at the edge of the Cameroonian Grassfields . Jeff Good and Pierpaolo DiCarlo (2012) · http://www.acsu.buffalo.edu/~jcgood/DiCarloGood-LFIdeology.pdf

Die !Kung-Buschleute ( pp. 91-189 ) . J. H. Wilhelm (1953) · Jahrbuch des Museums für Völkerkunde. 12

A Preliminary Study on the Trung Language of Kung Shan ( pp. 343-348 ) . Lo Ch'ang-p'ei (1945) · Harvard Journal of Asiatic Studies. 8 (3/4) ·