Ijoid has not yet been shown to contain systematic sound correspondences, noun class systems or verbal extensions with Niger-Congo in some form Tom Güldemann 2018: 174-177 , 232-234, 353-358.
Jenewari, Charles E. W. 1989 , Connell, Bruce and Bennett, William and Essien, Inoma and Obikudo, Ebitare and Akinlabi, Akin and Ndimele, Ozo-mekuri 2012
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