1. Baikie W. B. , in Narrative of an Exploring Voyage up the Rivers Kwora and Benue in 1854, 286–7;
2. Thurston Shaw , Radiocarbon Dating in Nigeria (1968)).
3. Lévi-Strauss C. , The Savage Mind, 26.
4. Cf. S. Crowther and Schon J. F. , Journal of an Expedition up the Niger and Tshadda rivers…in 1854, 66.