http://www.rogerblench.info/Language/Niger-Congo/Ijoid/Ijoid%20page.htm (Any fulltext)
http://www.rogerblench.info/Language/Niger-Congo/Ijoid/Kirike/KIRIKE%20dictionary.pdf (Any fulltext)
Sika, L. (2005). Kirikeni okueingbolu diri: Okrika dictionary. [Cambridge]: N.A.