A very popular book in the teaching of microeconomics is Varian’s Microeconomic Analysis. (3rd ed. New York: W.W. Norton & Company, 1992).
MIT OpenCourseWare offers Prof. Izmalkov’s answers to the even-numbered textbook problems used in the course. As Varian’s textbook contains only the answers to odd-numbered problems, Prof. Izmalkov’s answers may be helpful to students who want to deepen their understanding of microeconomics.