1. School textbook center or bookstore: Many schools have special textbook service centers or campus bookstores, which generally sell textbooks needed for their own courses. This is the most direct and reliable way to buy, and the textbook version has a high degree of matching with the course.

2. Regular physical bookstores: large chain bookstores such as Xinhua Bookstore and Education Bookstore usually have a rich inventory of teaching materials, covering all disciplines and grades. These bookstores have a good reputation, and the teaching materials are authentic and complete, so you can buy them on the spot.

3. Online e-commerce platforms: such as Amazon, Dangdang, JD.COM, Taobao and other online shopping platforms, as well as websites that specialize in selling teaching materials, such as Confucius used books. There are a large number of old and new textbooks for you to choose from on these platforms. You can search accurately according to the information such as book title, author and ISBN code, which is convenient and quick. Pay attention to choose sellers with good reputation and check user comments when buying.