References
- Dias A J. Portuguese contribution to cultural anthropology. Witwatersrand University Press, Johannesburg 1961; 38
- Rouas A, Gauthier J G. Mutilations ethniques oro-labiales. Inform Dent 1991; 73: 1965–8
- Bowie D F. The lip plug or ‘ndonya’ among the tribes of the southern province. Tanganyika Notes and Records 1949; 73–7
- Gupta K S. Ndonya' or lip plug in the wamakonde women. Tanz Dent Assoc Dent J 1986; 36: 37–40