Simple and rude methods are also the most direct and effective methods. Search directly in Baidu, but the search here requires certain skills. For example, we want to find the textbook of Tongji University, which version of advanced mathematics. At this time, we need to search in Baidu like this: download Tongji University pdf, the seventh edition of advanced mathematics.

2. National Library Reference Alliance Network

The national library reference service is a completely free paper search and download website, which is very powerful! It not only supports searching papers, but also supports searching books, periodicals, papers, newspapers, standards, scientific and technological reports, and even supports searching audio and video. You can search for the required learning video. The most important thing is to download electronic college textbooks!

3. The official website of book publishing house.

Only the full-text preview of teaching materials is provided (downloading is not supported). The most common publishing houses of university textbooks are Higher Education Publishing House (check the electronic version in Higher Education Bookstore, Baidu directly searches for Higher Education Bookstore), Machinery Industry Publishing House (check the electronic version in Hot Spring School, Baidu directly searches for Hot Spring School) and so on.