Calculus

Introduction to Infinitesimal Analysis; Functions of One Real Variable

Oswald Veblen
N. J. (Nels Johann) Lennes

Elementary Illustrations of the Differential and Integral Calculus

Augustus De Morgan

A Course of Pure Mathematics

Third Edition

G. H. (Godfrey Harold) Hardy

Calculus Made Easy

Being a very-simplest introduction to those beautiful methods which are generally called by the terrifying names of the Differential Calculus and the Integral Calculus

Silvanus P. (Silvanus Phillips) Thompson