Chapter 3 (On the Infinite and the Infinitely Small) and Chapter 4 (On the Nature of Differentials of Each Order)
Leonhard Euler, Foundations of Differential Calculus. Part I. Translated by John D. Blanton. (New York: Springer-Verlag, 2000).
Euler, Leonhard, "Foundations of Differential Calculus. Part I" (2000). 2019, November 1-2 ORESME Reading Group Meeting. 2.