$worksheet->write_url('A6',  'internal:Sheet2!A1'                   );
    $worksheet->write_url('A7',  'internal:Sheet2!A1',   $format        );
    $worksheet->write_url('A8',  'internal:Sheet2!A1:B2'                );
    $worksheet->write_url('A9',  q{internal:'Sales Data'!A1}            );