The role of international standard book number:

1, which distinguishes letters and numbers between one book and another. ?

2, the unified number of legally published books.

3. If there is no ISBN, it becomes internal information, and internal information is not allowed to be priced and sold.

Extended data

China international standard book number standard:

1982 China participated in the ISBN system and established the ISBN center in China. The Chinese Standard Book Number (ISBN) was implemented from 0987+65438+65438 in 10, and completely replaced the original unified book number from 0988+0+65438 in 10.

The Chinese standard book number * * * is divided into two parts. The first part is ISBN, which is the main part; The second part is the basic category number and category number of China Library Classification.

The class number and the species number are separated by a middle dot (). The first part and the second part are arranged in two rows, or they may be separated by diagonal lines and arranged in one row. For example, ISBN 7-144-00316-x/tp.340.

Baidu encyclopedia -ISBN