1. What’s a Wh-Word Got to Do with It?
2. Ajíbóyè, O. (2005). Topics on Yorùbá Nominal Expressions. Ph.D Thesis. University of British Columbia.
3. Àkànbí, T. A. (2011). "The syntax and Semantics of Interrogative Verbs "Dà" and "Ńkọ́" in Yorùbá". Inquiry in African Languages and Literatures. No. 8. pp. 1-26.
4. On The WH Question Particle [Wo] In Yorùbá̀
5. Awóbùlúyì, O. (1978). Essentials of Yorùbá Grammar. Oxford University Press Ibadan, Nigeria.