Tag your references in Drupal:

  1. Log in to your Drupal admin panel.
  2. Click on “Site building,” and then “Blocks”.
  3. Click on “Add block.”
  4. Copy and paste the Reftagger script in a new block. Give it a name you’ll remember,
    such as “Reftagger.”
  5. Change the input format to full HTML.
  6. Save the block.
  7. Activate your block as a footer block, and every reference on your site will be tagged.