Hello everyone. Actually my father is willing to learn calculus. He is good in number system and trigonometry and other basic mathematics. He doesn't know about Calculus and Functions. So I want you to suggest some book, which is really good for a beginner in Calculus and I don't need problems in that book because my father is not going to write exams. He just wants to learn it. Is there any book which deals completely with Calculus intuitively? Thanks in advance.