"New recommendations from the Book Industry Study Group as to how publishers assign ISBN numbers to their books are intended to anticipate further innovations in publishing.

After years of debate in the industry as to how e-books, apps and other kinds of digital editions should be classified, the BISG has set guidelines for publishers and their partners as to assign separate ISBN numbers for each version of a book - hardcover, paperback, ePub, PDF, for example.

While the guidelines address the many new formats that exist today because of the proliferation of e-readers and tablets, they are also designed to address future formats that could be invented..."

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