Lee, Wai-Sum and Zee, Eric. 2009. Illustrations of the IPA: Hakka Chinese. Journal of the International Phonetic Association 39. 107–111. Cambridge University Press.
@article{hak_lee2009, author = {Lee, Wai-Sum and Zee, Eric}, journal = {Journal of the International Phonetic Association}, number = {1}, pages = {107–111}, publisher = {Cambridge University Press}, title = {Illustrations of the IPA: Hakka Chinese}, volume = {39}, year = {2009} }