1. bin Yahya al. Wangari M (2008) In: Jeppie S, Diagne SB (eds) The meanings of Timbuktu. HSRC Press, Cape Town, pp 277–285
2. Evans J (1998) The history and practice of ancient astronomy. Oxford University Press, New York
3. Hunwick J (1999) Timbuktu and the Songhay Empire: Al-Sadi’s Tarickh Al-Sudan down to 1613 and other contemporary documents. Brill Academic, Leiden
4. Series of studies and sources on history of science 11;E Ihsanoglu,2003
5. King DA (1996) Islamic astronomy. In: Walker C (ed) Astronomy before the telescope. British Museum Press, London, pp 143–174