Ikekeonwu, Clara I. 1991. Illustrations of the IPA: Igbo. Journal of the International Phonetic Association 21. 99–101. Cambridge University Press.
@article{ibo_ikekeonwu1991, author = {Ikekeonwu, Clara I}, journal = {Journal of the International Phonetic Association}, number = {2}, pages = {99–101}, publisher = {Cambridge University Press}, title = {Illustrations of the IPA: Igbo}, volume = {21}, year = {1991} }