I have two books, both of which were bought in 2006. After reading the content, it is really a bit one-sided and will confuse beginners. It is of little use to a novice master for about a year. If you still want to buy it after listening, you can go to Guangzhou-Huadu District-Shiling Town-Shiling Hospital. There is an elf bookstore on that street, which sells it. You can also find training websites and buy from them. You can also check it on Taobao. Maybe some.