Coba jelasin Lihat pula dari Speusippos dong

Plato's unwritten doctrines, for debates in the Early Academy over Plato's esotericism

Elias Bickermann and Johannes Sykutris, Speusipps Brief an König Philipp: Text, Übersetzung, Untersuchungen, Berichte über die Verhandlungen der Sächsischen Akademie der Wissenschaften zu Leipzig: Philologisch-historische Klasse 80:3 (1928)

Margherita Isnardi Parente, Speusippo: Frammenti. Edizione, traduzione e commento, Naples: Istituto Italiano per gli Studi Filosofici, 1980

Leonardo Tarán, Speusippus of Athens: A Critical Study with a Collection of the Related Texts and Commentary, Leiden: Brill, 1982

Anthony Francis Natoli, The Letter of Speusippus to Philip II: Introduction, Test, Translation, and Commentary (Historia Einzeschriften 176), Stuttgart: Franz Steiner, 2004