Teo, Amos. 2012. Illustrations of the IPA: Sumi (Sema). Journal of the International Phonetic Association 42. 365–373. Cambridge University Press.
@article{nsm_teo2012, author = {Teo, Amos}, journal = {Journal of the International Phonetic Association}, number = {3}, pages = {365–373}, publisher = {Cambridge University Press}, title = {Illustrations of the IPA: Sumi (Sema)}, volume = {42}, year = {2012} }