To identify whether a book was genuine or not, one could refer to the following methods: 1. Check the cover of the book: The cover of a legitimate book usually has the name of the book, author, publication date, publishing house, and other information. The printing quality is good. On the other hand, the cover of a pirated book might only contain the title or author's information. 2. Check the book packaging: Genuine books usually have complete packaging including book cover, book waist, spine, book case, etc. The packaging of pirated books might be incomplete or missing. 3. Check the content of the book: The content, font, format, etc. of the genuine book are relatively standard and the printing quality is good. The content of pirated books might have errors, missing prints, and font distortions. 4. Searching for the copyright information of a book: The copyright information of a genuine book can usually be found online, including the ismn number, author, publishing house, publication date, etc. The copyright information of pirated books might not be found. If you doubt the authenticity of a book, you should go to a regular bookstore or online bookstore to check to make sure that the book you bought is genuine. In addition, you can also send an email to the publishing house or author to check the authenticity of the book to ensure that the book you buy is genuine.