I kept this on my bookshelf after purchasing it. I didn't use it at all because I was using a different reference book as my main one. Bundling with other products is also possible. The product description is as follows: "Thorough Study of Differential and Integral Calculus for Transfer Students: Organization of Basic Matters and Problem Exercises" Motoharu Sakurai Price: ¥2800 #MotoharuSakurai #book #nature/mathematics