hook_views_data & JOIN

Hi every body

I'm french so sorry for my english.

I have a problem with hook_views_data.

I want to display in a view the title of the nid countain in the field of a table who I created and I don't know how make to display this title I arrive only to diplay his nid.

I have this code for the moment :

function courses_views_data()
{
 
   $data['ma_table_ref']['table']['group'] = t('Mon nom');

        $data['ma_table_ref']['table']['join'] = array(
                                         'node' => array(
                                                          'left_field' => 'nid',
                                                          'field' => 'nid',
                                                       ),
                                         );
    //This is here I want to display the title and not the nid
$data['ma_table_ref']['nid_du_champ_ref'] = array(
         'title' => t('Fournisseur'),
            'help' => t(utf8_encode('Fournisseur du produit.')),
            'field' => array(
              'handler' => 'views_handler_field',
                 'click sortable' => TRUE,
                 ),
            'filter' => array(
                   'handler' => 'views_handler_filter',
                 ),
         'sort' => array(
                'handler' => 'views_handler_sort',
                  ),
   );
  return $data;

}

I need some helps pleazzzzzzzzzzz

Thanks