Courtenay, Karen. 1971. Yoruba: A Terraced-level Language with Three Tonemes. Studies in African Linguistics 2(3). 239.
@article{courtenay1971yoruba, author = {Courtenay, Karen}, journal = {Studies in African Linguistics}, number = {3}, pages = {239}, title = {Yoruba: A Terraced-level Language with Three Tonemes}, volume = {2}, year = {1971} }