https:// en.wikipedia.org/wiki/List_of_Esperanto_speakers

https:// en.wikipedia.org/wiki/Native_Esperanto_speakers

https:// www.huffingtonpost.it/2018/05/29/la-tecnologia-e-lesperanto-del-nostro-tempo-come-la-lingua-universale-puo-insegnarci-pace-e-neutralita-oggi_a_23445878/

https:// www.lesfrontaliers.lu/societe/lesperanto-une-langue-aux-accents-de-paix