Textbooks Instructors can add and manage multiple textbooks in SAM courses. Add TextbooksAdd one or more textbooks to your section. Students cannot open a textbook unless it is added to their section. Remove TextbooksRemove textbooks from your section. Manage TextbooksManage textbooks for your section. Find Instructor ResourcesCengage products often include resources you can use to supplement your online classes. Open the Instructor Companion Site to see what instructor resources are available for your product. View the product details in your library to see what instructor resources are available for your product.