1. Alidou H. Boly A. Brock‐Utne B. Diallo Y. S. Heugh K. &Wolff H. E.(2006).Optimizing learning and education in Africa–The language factor: A stock‐taking research on mother tongue and bilingual education in Sub‐Saharan Africa. Association for the Development of Education in Africa (ADEA).http://policytoolbox.iiep.unesco.org/library/KWT4VZ8Z
2. The Multilingual Reality