El-Bizri, Nader (2007). "In Defence of the Sovereignty of Philosophy: al-Baghdadi's Critique of Ibn al-Haytham's Geometrisation of Place". Arabic Sciences and Philosophy. 17 (1): 57–80. doi:10.1017/s0957423907000367. S2CID170960993.
El-Bizri, Nader (2007). "In Defence of the Sovereignty of Philosophy: al-Baghdadi's Critique of Ibn al-Haytham's Geometrisation of Place". Arabic Sciences and Philosophy. 17 (1): 57–80. doi:10.1017/s0957423907000367. S2CID170960993.
Aristotle, "Book 5, section 1013a", Metaphysics, Hugh Tredennick (trans.) Aristotle in 23 Volumes, Vols. 17, 18, Cambridge, MA, Harvard University Press; London, William Heinemann Ltd. 1933, 1989; (hosted at perseus.tufts.edu.) Aristotle also discusses the four causes in his Physics, Book B, chapter 3.