1. Akinwumi, O. et al. (2007). African indigenous science and knowledge systems – Triumphs and tribulations – Essays in honour of Gloria Thomas Emeagwali. Abuja: Roots.
2. Amusan, A. (2009). Herbal medicine in Swaziland. In H. Rodolfo Juliani et al. (Eds.), African natural plant products: New discoveries and challenges in chemistry and quality. Washington D.C: American Chemical Society.
3. Beaumont et al. (2012). Early evidence of San material culture represented by organic artifacts from Border Cave, South Africa. Proceedings of the National Academy of Sciences of the United States of America, 109(33) (August 14).
4. Bekerie, A. (2010). Interview held at Mekelle University, Mekelle, Ethiopia.
5. Barratt Brown, A. (1997). Africa’s choices after thirty years of the World Bank.