Concepts of Calculus by Christopher Cooper
Publisher: Macquarie University 2008
This is an introductory course on calculus for those who haven't studied it before. It emphasizes the concepts rather more than the technicalities and contains many examples and illustrations. It's particularly suitable for economics students and hence includes an elementary chapter on Lagrange Multipliers, something not normally done at this introductory level.
Mathematics Analysis & Calculus Calculus Single Variable