1. Altmann, A. (1956–1957). Isaac Israeli’s chapter on the elements. Journal of Jewish Studies, 7, 31–57.
2. Muckle, J. T. (1937–1938). Isaac Israeli, Liber de definicionibus. Archives d’histoire doctrinale et litteraire du Moyen Age, 12, 299–340.
3. The book of definitions; The book of substances; The book on spirit and soul; The book on the elements (an excerpt) (ed.: Altmann, A., Stern, S. M.). In Altmann, A., & Stern, S. M. (1958). Isaac Israeli. A Neoplatonic philosopher of the early tenth century (pp. 3–145). London: Oxford University Press.