Reference: Courtenay 1971

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}
}