Aristotle (384-322 BC) Translated by R. P. Hardie and R. K. Gaye. Physics, Book VIII, Chapter 6. Logos Virtual Library ed. Darren L. Slider. https://www.logoslibrary.org/aristotle/physics/806.html
Cohen, S. Marc and C. D. C. Reeve, "Aristotle’s Metaphysics", The Stanford Encyclopedia of Philosophy (Winter 2020 Edition), Edward N. Zalta (ed.) (Especially section 14 on Theology)