[Al-jabber, J. A. (2003). Habitat fragmentation: Effects and implications. Informally published manuscript, Kansas State University, Manhattan, KS, Retrieved from http://faculty.ksu.edu.sa/a/Documents/Habitat[permanent dead link] Fragmentation Effects and Implication.pdf]
National Oceanic and Atmospheric Administration. (1998). "Answers to La Nina Frequently Asked Questions." United States Department of Commerce. Retrieved from: http://www.elnino.noaa.gov/lanina_new_faq.html
npr.org
stateimpact.npr.org
[Amico, Chris, Danny DeBelius, Scott Detrow, and Matt Stiles. "Natural Gas Drilling in Pennsylvania". National Public Radio, 2011. Web. 24 Feb 2013. <http://stateimpact.npr.org/pennsylvania/drilling/>.]