Alternate links in a multilingual site Drupal 7
You can use Meta Tags module for canonical links.


  The Meta tags module allows you to automatically provide structured
  metadata, aka "meta tags", about your website. In the context of
  search engine optimization, when people refer to meta tags, they are
  usually referring to the meta description tag and the meta keywords
  tag that may help improve the rankings and display of your site in
  search engine results.
  
  Meta tags have additional uses like the Open Graph Protocol used by
  Facebook, specifying the canonical location of content across multiple
  URLs or domains.