Law, « Wheeled Transport in Pre-Colonial West Africa », Journal of the International African Institute, vol. 50, no 3, , p. 249–262 (DOI10.2307/1159117, JSTOR1159117)
Law, « Wheeled Transport in Pre-Colonial West Africa », Journal of the International African Institute, vol. 50, no 3, , p. 249–262 (DOI10.2307/1159117, JSTOR1159117)