I'm looking for a book that could help me get a better grasp on calculus and its related concepts. I've been through all 3 calc courses (covered derivatives, integrations and techniques, vectors and fields and 3 dimensional applications) but i dont feel as though i've completely grasped everything involved. I'm hoping to build a more intuitive understanding if possible. I've been considering the book "Calculus: An Intuitive and Physical Approach" but have heard that it lacks in the area of proofs, which I was really hoping to come to understand. Would anyone have any recommendations for a good book to help me reach this end?