1. Alexander of Hales . 1924–1948. “Summa theologica”. 4 vols. Quaracchi
2. Alphandéry , P. 1903. “Les idées morales chez les hétérodoxes latins au debut du XIIIe siècle”. Paris
3. Boswell , J. 1980. “Christianity, social tolerance and homosexuality: gay people in Western Europe from the beginning of the Christian era to the fourteenth century”. Chicago