1. Aquinas. 1968. Summa Contra Gentiles. Madrid: BAC.
2. Aquinas. 1951. Sententia Libri Politicorum, edited by R.M. Spiazzi. Torino: Marietti.
3. Aristotle. 1962. Ethica Nicomachea, edited by I. Bywater. Oxford: Clarendon Press.
4. Aristotle. 1964. Politica, edited by W.D. Ross. Oxford: Clarendon Press.
5. Aristotle. 1967. Ethica Eudemia, edited by F. Susemihl. Leipzig: Teubner.