4. Introduction to contemporary Igbo grammar & linguistics for secondary school & colleges of education [2007]
5. Igbo grammar [1997]
6. Tone in Igbo syntax [1995]
7. The tonal system of Igbo [1990]
9. The foundations of Igbo studies : a short history of the study of Igbo language and culture [1983]
10. Igbo journal of SPILC [1982 - ]
14. Standard Igbo, path to its development [1974]
15. An Introduction to Ị̀ka and Ụkwụanị̀. [1968]
16. The principles of Ibo [1967]
17. A short Igbo grammar [1964]
18. A descriptive grammar of Igbo [1963]
19. A modern Ibo grammar [1932]
20. Achara : jọnalụ nkwalite asụsụ Igbo [2018 - ]
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