Hassan, Ahmad Y (1996). „Factors Behind the Decline of Islamic Science After the Sixteenth Century”. Ур.: Sharifah Shifa Al-Attas. Islam and the Challenge of Modernity, Proceedings of the Inaugural Symposium on Islam and the Challenge of Modernity: Historical and Contemporary Contexts, Kuala Lumpur, August 1–5, 1994. International Institute of Islamic Thought and Civilization (ISTAC). стр. 351—399. Архивирано из оригинала 2. 4. 2015. г.
hyperhistory.net
Nosotro, Rit (2003), Harun al'Rashid, Архивирано из оригинала 27. 12. 2009. г., Приступљено 27. 12. 2009
Nosotro, Rit (2003), Harun al'Rashid, Архивирано из оригинала 27. 12. 2009. г., Приступљено 27. 12. 2009
Hassan, Ahmad Y (1996). „Factors Behind the Decline of Islamic Science After the Sixteenth Century”. Ур.: Sharifah Shifa Al-Attas. Islam and the Challenge of Modernity, Proceedings of the Inaugural Symposium on Islam and the Challenge of Modernity: Historical and Contemporary Contexts, Kuala Lumpur, August 1–5, 1994. International Institute of Islamic Thought and Civilization (ISTAC). стр. 351—399. Архивирано из оригинала 2. 4. 2015. г.
