ISBN 9787107312403. According to the inquiry of Wen Rui. Com, the bar code on the back of the first-grade Chinese book published by PEP belongs to ISBN code, that is, the international standard book number. The ISBN code 1 * * has 13 digits, and the barcode on the back of the first-grade Chinese book published by People's Education Press is ISBN 9787107312403. The book barcode records the information of the book, and you can know the name and other information of the book by scanning the barcode.