Ramkrishna Ghosh & Kantish Chandra Maity 
Integral Calculus (Including and Introduction to Differential Equations) [PDF ebook] 
Including and Introduction to Differential Equations

This book, aimed at Honours level students of courses of all major universities, has been thoroughly revised with the introduction of new concepts and notations. For examples, the natural logarithm loge has been replaced by ln, the function f(x) by f etc. Besides, some new definitions have also been included in the text. Introduction of chapter-wise important problems along with their solutions will surely prove to be worthwhile for the students.