"European Trade, Colonialism, and Human Capital Accumulation in Senegal, Gambia and Western Mali, 1770–1900 – African Economic History Network". www.aehnetwork.org.
17 Ağustos 2016 tarihinde kaynağından arşivlendi.  ^ "European Trade, Colonialism, and Human Capital Accumulation in Senegal, Gambia and Western Mali, 1770–1900 – African Economic History Network". www.aehnetwork.org (İngilizce).