1. Agbo, M. (In Preparation) Causative Constructions in Igbo
2. Agbo, M. 2013. A Role and Reference Grammar Analysis of the Igbo Verb. Ph.D Dissertation. University of Ibadan
3. Anyanwu, O. 2005. Analytical Causatives in Igbo. In O. Ndimele (ed.), Trends in the Study of Languages and Linguistics in Nigeria (A Festschrift for P.A. Nwachukwu) 609-631. Port Harcourt: Grand Orbit Communication & Emhai Press
4. Anyanwu, O. 2007. The Syntax of Igbo Causatives. Port Harcourt: M & J Grand Orbit Communications
5. Baker, M. 1988. Incorporation: A Theory of Grammatical Function Changing. Chicago, IL: Chicago University Press