Di Serio, Chiara (2020). "Utopian Elements in Porphyry's De abstinentia". Studia Ceranea. Journal of the Waldemar Ceran Research Centre for the History and Culture of the Mediterranean Area and South-East Europe. 10: 47–61. doi:10.18778/2084-140X.10.03. hdl:11089/38895.
Brisson, Luc (2000). "Firmus Castricius". In Goulet, Richard (ed.). Dictionnaire des philosophes antiques (in French). Vol. III (Nouv. éd. ed.). Paris: CNRS éd. p. 425. ISBN2271057485. Archived from the original on 22 January 2024. Retrieved 21 January 2024.
Di Serio, Chiara (2020). "Utopian Elements in Porphyry's De abstinentia". Studia Ceranea. Journal of the Waldemar Ceran Research Centre for the History and Culture of the Mediterranean Area and South-East Europe. 10: 47–61. doi:10.18778/2084-140X.10.03. hdl:11089/38895.
Emilsson, Eyjólfur (2022). "Porphyry". The Stanford Encyclopedia of Philosophy. Metaphysics Research Lab, Stanford University. Archived from the original on 22 January 2024. Retrieved 21 January 2024.
Brisson, Luc (2000). "Firmus Castricius". In Goulet, Richard (ed.). Dictionnaire des philosophes antiques (in French). Vol. III (Nouv. éd. ed.). Paris: CNRS éd. p. 425. ISBN2271057485. Archived from the original on 22 January 2024. Retrieved 21 January 2024.
Emilsson, Eyjólfur (2022). "Porphyry". The Stanford Encyclopedia of Philosophy. Metaphysics Research Lab, Stanford University. Archived from the original on 22 January 2024. Retrieved 21 January 2024.