Resources:National Snow and Ice Data Center, http://nsidc.org/ (last visited July 25, 2012)
World Glacier Monitoring Service, http://www.geo.uzh.ch/microsite/wgms/index.html (last visited July 25, 2012).
Petermann Glacier, Image of the Day, NASA, http://www.nasa.gov/multimedia/imagegallery/image_feature_2310.html (last visited July 25, 2012).
Iceberg Breaks Off from Greenland's Petermann Glacier, BBC News (July 18, 2012), http://www.bbc.co.uk/news/world-18896984 (video).
Joanna M. Foster, Green: Again, A Glacier Downsizes, NY Times (July 18, 2012), http://green.blogs.nytimes.com/2012/07/18/again-a-glacier-downsizes/.
Seth Borenstein, Petermann Glacier in Greenland Breaks Off Iceberg Twice the Size of Manhattan, Huffington Post (July 17, 2012), http://www.huffingtonpost.com/2012/07/18/greenlands-petermann-glacier-iceberg_n_1682463.html.