The way to find the electronic version with isbn number is to use the service platform of publishing data center. ISBN is an international number, which is specially used to identify books and other documents. ISO promulgated the ISBN international standard in 1972, and set up the international ISBN center in the Prussian Library in West Berlin, which is the management institution for implementing the standard. Publications using ISBN coding system include: books, pamphlets, microforms, braille prints, etc.