(en) V. C. Onumajuru, « A contrastive study of two varieties of Onicha and the Central Igbo language », AFRREV IJAH: An International Journal of Arts and Humanities, vol. 5, no 2, , p. 225–240 (ISSN2227-5452, DOI10.4314/ijah.v5i2.18, lire en ligne)
(en) V. C. Onumajuru, « A contrastive study of two varieties of Onicha and the Central Igbo language », AFRREV IJAH: An International Journal of Arts and Humanities, vol. 5, no 2, , p. 225–240 (ISSN2227-5452, DOI10.4314/ijah.v5i2.18, lire en ligne)
(en) V. C. Onumajuru, « A contrastive study of two varieties of Onicha and the Central Igbo language », AFRREV IJAH: An International Journal of Arts and Humanities, vol. 5, no 2, , p. 225–240 (ISSN2227-5452, DOI10.4314/ijah.v5i2.18, lire en ligne)