<P> Currently the barcodes on a book 's back cover ( or inside a mass - market paperback book 's front cover ) are EAN - 13 ; they may have a separate barcode encoding five digits called an EAN - 5 for the currency and the recommended retail price . For 10 digit ISBNs , the number `` 978 '' , the Bookland `` country code '' , is prefixed to the ISBN in the barcode data , and the check digit is recalculated according to the EAN13 formula ( modulo 10 , 1x and 3x weighting on alternate digits ) . </P>
<P> Currently the barcodes on a book 's back cover ( or inside a mass - market paperback book 's front cover ) are EAN - 13 ; they may have a separate barcode encoding five digits called an EAN - 5 for the currency and the recommended retail price . For 10 digit ISBNs , the number `` 978 '' , the Bookland `` country code '' , is prefixed to the ISBN in the barcode data , and the check digit is recalculated according to the EAN13 formula ( modulo 10 , 1x and 3x weighting on alternate digits ) . </P>
where does the isbn number go on a book
where does the isbn number go on a book
on a book 's back cover inside a mass - market paperback book 's front cover
on a book 's back cover inside a mass - market paperback book 's front cover