$form .= Html::hidden( 'title', $this->getPageTitle()->getPrefixedText() ) . "\n";
$form .= '<p>' . Xml::inputLabel(
$this->msg( 'booksources-isbn' )->text(),
$form .= Html::hidden( 'title', $this->getPageTitle()->getPrefixedText() ) . "\n";
$form .= '<p>' . Xml::inputLabel(
$this->msg( 'booksources-isbn' )->text(),