Continuity and Infinitesimals (Luku 1: Introduction: The Continuum, the Discrete and the Infinitesimal) Stanford Encyclopedia of Philosophy. Viitattu 4.12.2020.
Continuity and Infinitesimals (Luku 2: The Continuum and the Infinitesimal in the Ancient Period) Stanford Encyclopedia of Philosophy. Viitattu 4.12.2020.