Ding, Jennifer & Dong, Pinliang. Retreating Glaciers of the Himalayas: A Case Study of Gangotri Glacier Using 1990-2009 Satellite Images. UNT Digital Library. http://digital.library.unt.edu/ark:/67531/metadc84326/. Accessed June 19, 2013.
Ding, Jennifer & Dong, Pinliang. Retreating Glaciers of the Himalayas: A Case Study of Gangotri Glacier Using 1990-2009 Satellite Images. UNT Digital Library. http://digital.library.unt.edu/ark:/67531/metadc84326/. Accessed June 19, 2013.