1. Albert 1989: Karl Albert, Über Platons Begriff der Philosophie, Academia Verlag, Sankt Augustin 1989.
2. - Alieva 2013: Olga Alieva, Protreptic in the Socratics: in Search of a Genre, in Ful- via de Luise / Alessandro Stavru (eds.), Socratica III. Studies on Socrates, the Socra- tics, and the Ancient Socratic Literature, Academia Verlag, Sankt Augustin 2013, pp. 128-139.
3. - Annas 1985: Julia Annas, Self-knowledge in Early Plato, in Dominic O’Meara (ed.), Platonic Investigations, Catholic University of America Press, Washington 1985, pp. 111-138.
4. - Berti 2000: Enrico Berti, Aristotele. Protreptico. Esortazione alla filosofia, UTET, Torino 2000.
5. - Berti 2010: Enrico Berti, Sumphilosophein. La vita nell’Accademia di Platone, Later- za, Roma-Bari 2010.