) if $isbn;
}
=head2 NormalizedISBN
=head2 NormalizeISBN
my $isbns = NormalizedISBN({
my $isbns = NormalizeISBN({
isbn => $isbn,
strip_hyphens => [0,1],
format => ['ISBN-10', 'ISBN-13']
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
use Modern::Perl;
use Business::ISBN;
use parent qw( Exporter );
-