I should say serial number. The book number refers to a series of books with book numbers * * * For example, 10 books form a series of so-and-so books, and this 10 book has only one book number, which is the book number. Strictly speaking, the published set of books should be packaged in letter sets or plastic packaging as a whole, and the individual books inside cannot be priced separately, so the total pricing of this set of books must be written. -The Gulu cultural media publishes books.