| Peters, F. U. (2013). Religion and Ethno-Philosophy of Change. Oxford: Clarendon Press. | | | | |
| Peil, M. (1977). Consensus and Conflict in African Societies. London: Longman. | | | | |
| Okwu, V. N. (2014). Oral Interview Granted 21st January 2014 at Obosi-Ogba Land. Occupation: Wood Caver, Age: 70 Years. | | | | |
| Ogidi, R. B. (2014). Oral Interview Granted 5th March 2014 at Omoku-Ogba Land. Occupation: Farmer, Age: 72 Years. | | | | |
| Masi, I. W. (2011). Themes in the Socio-Ethical Values of African Religion. Port Harcourt: View Publishing Company. | | | | |