statistique, Office fédéral de la. "Votations". www.bfs.admin.ch (in French). Retrieved 13 March 2022.
ch.ch
"Referendums". ch.ch - A service of the Confederation, cantons and communes. Berne, Switzerland: Swiss Confederation. Archived from the original on 10 January 2017. Retrieved 9 January 2017.
"Referendums". ch.ch - A service of the Confederation, cantons and communes. Berne, Switzerland: Swiss Confederation. Archived from the original on 10 January 2017. Retrieved 9 January 2017.