Andres Betschart, ed. (2011). "World of glaciers"(PDF) (in ஜெர்மன் and ஆங்கிலம்) (1 ed.). Naters, Switzerland: Stiftung UNESCO Welterbe Schweizer Alpen Jungfrau-Aletsch, Managementzentrum. Archived from the original(PDF) on 14 April 2016. Retrieved 2016-02-14.
Andres Betschart, ed. (2011). "World of glaciers"(PDF) (in ஜெர்மன் and ஆங்கிலம்) (1 ed.). Naters, Switzerland: Stiftung UNESCO Welterbe Schweizer Alpen Jungfrau-Aletsch, Managementzentrum. Archived from the original(PDF) on 14 April 2016. Retrieved 2016-02-14.