Coba jelasin Rujukan dari Kitab Roger dalam bahasa melayu dong

Bacharach, Jere L. (2006). Medieval Islamic Civilization: An Encyclopedia. Routledge. ISBN 978-0-415-96690-0

Harley, John Brian and Woodward, David (1992). The History of Cartography, Volume 2. Oxford University Press. ISBN 978-0-226-31635-2

Houben, Hubert (2002). Roger II of Sicily: A Ruler Between East and West. Cambridge University Press. ISBN 978-0-521-65573-6

The World Maps of al-Idrisi

Online exhibition, Bibliothèque nationale de France (French)

View Online at the BNF (653 pages).

Abad ke-12 dalam bidang sains

Karya geografi Islam abad pertengahan