Sources

http://www.grid.unep.ch/glaciers/pdfs/3.pdf
https://www.mnn.com/earth-matters/wilderness-resources/stories/types-glaciers

https://nsidc.org/cryosphere/glaciers
https://www.usgs.gov/faqs/what-a-glacier?qt-news_science_products=0#qt-news_science_products

Cuffey, K. M., and W.S.B Paterson. The Physics of Glaciers. Elsevier, 2011.

Ritter, Dale F., et al. Process Geomorphology. Waveland, 2011.