* [[https://www.duolingo.com/course/eo/es/Learn-Esperanto|https://www.duolingo.com/course/eo/es/Learn-Esperanto]]
  * [[https://learn.esperanto.com/|https://learn.esperanto.com/]]
  * [[https://lernu.net|https://lernu.net]]
  * [[http://www.kurso.com.br/index.php?es|http://www.kurso.com.br/index.php?es]]
  * https://es.wikibooks.org/wiki/Esperanto