1. Anderson AP, Hardy EE, Roach JT, Witmer RE (1976) A land use and land cover classification system for use with remote sensor data. U.S. Geological Survey Professional Paper 964
2. Arendt R, Brabec EA, Dodson H, Reid C, Yaro RD (1994) Rural by design: maintaining small town character. American Planning Association, Chicago
3. Brabec E, Smith C (2002) Agricultural land fragmentation: the spatial effects of three land protection strategies in the eastern United States. Landscape Urban Planning 58:255–268
4. Brittingham MC, Goodrich LJ (2010) Habitat fragmentation: a threat to Pennsylvania’s forest birds. In: Majumdar SK, Master TL, Brittingham M, Ross RM, Mulvihill R, Huffman J (eds) Avian ecology and conservation: a Pennsylvania focus with national implications. Pennsylvania Academy of Science, Easton, pp 204–216
5. Campbell K, Horne M (2011) Shale gas in British Columbia: risks to B.C.’s water resources. The Pembina Institute and The Pembina Foundation. http://www.vancouversun.com/pdf/shale-and-water.pdf Accessed 7 Feb 2011