Hahm, David E. (1982). «The fifth element in Aristotle's De Philosophia: A Critical Re-Examination». The Journal of Hellenic Studies. 102: 60–74, her s.62. JSTOR631126. doi:10.2307/631126.
jstor.org
Hahm, David E. (1982). «The fifth element in Aristotle's De Philosophia: A Critical Re-Examination». The Journal of Hellenic Studies. 102: 60–74, her s.62. JSTOR631126. doi:10.2307/631126.