Keuskupan SionPranala luar
- Sion in the Catholic Encyclopaedia
- The Beggar and the Professor, by Emmanuel Le Roy Ladurie — excerpt evocatively describes Thomas Platter's tour to Sion in 1563
- Cathédrale de Sion Diarsipkan 2006-03-19 di Wayback Machine. (link dead, as at[update] July 24, 2007)
- Kirsten Groß-Albenhausen (1996). "Theodor (Theodolus, Theodulus, St. Joder, Jodern, frz. Théodule, rätoroman. Sogn Gioder), Bischof von Octodurus (Martigny, Martinach)". Dalam Bautz, Traugott (ed.). Biographisch-Bibliographisches Kirchenlexikon (BBKL) (dalam bahasa Jerman). Vol. 11. Herzberg: Bautz. cols. 881–884. ISBN 3-88309-064-6.
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46°14′02″N 7°21′32″E / 46.2339°N 7.3589°E / 46.2339; 7.3589