(en) J. D. Y. Peel, « Kingdoms of the Yoruba. By Robert Smith. London: Methuen (Studies in African History 2), 1969. Pp. xiii + 226. 30s., cloth, 16s., paper. », Africa, vol. 40, no 1, , p. 84–84 (ISSN1750-0184 et 0001-9720, DOI10.2307/1157572, lire en ligne, consulté le )
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(en) J. D. Y. Peel, « Kingdoms of the Yoruba. By Robert Smith. London: Methuen (Studies in African History 2), 1969. Pp. xiii + 226. 30s., cloth, 16s., paper. », Africa, vol. 40, no 1, , p. 84–84 (ISSN1750-0184 et 0001-9720, DOI10.2307/1157572, lire en ligne, consulté le )
(en) J. D. Y. Peel, « Kingdoms of the Yoruba. By Robert Smith. London: Methuen (Studies in African History 2), 1969. Pp. xiii + 226. 30s., cloth, 16s., paper. », Africa, vol. 40, no 1, , p. 84–84 (ISSN1750-0184 et 0001-9720, DOI10.2307/1157572, lire en ligne, consulté le )