$form .= '<p>' . Xml::inputLabel( $this->msg( 'booksources-isbn' )->text(), 'isbn', 'isbn', 20, $this->isbn, array( 'autofocus' => true ) );
$form .= ' ' . Xml::submitButton( $this->msg( 'booksources-go' )->text() ) . "</p>\n";
$form .= Html::closeElement( 'form' ) . "\n";
$form .= '<p>' . Xml::inputLabel( $this->msg( 'booksources-isbn' )->text(), 'isbn', 'isbn', 20, $this->isbn, array( 'autofocus' => true ) );
$form .= ' ' . Xml::submitButton( $this->msg( 'booksources-go' )->text() ) . "</p>\n";
$form .= Html::closeElement( 'form' ) . "\n";