1. Who needs environmental monitoring? Frontiers in Ecology and the Environment;GM Lovett,2007
2. A continental strategy for the National Ecological Observatory Network. Frontiers in Ecology and the Environment;M Keller,2008
3. Coleman DC (2010) Big Ecology: the emergence of ecosystem science. University of California Press. Berkeley and Los Angeles, California. 248p.
4. Robbins CS, Bystrak D, Geissler PH (1986) The Breeding Bird Survey: Its First Fifteen Years, 1965–1979. U.S. Dept. of the Interior, Fish and Wildlife Service, Washington, D.C. (USA). 205p.
5. A hierarchical model for estimating change in American woodcock populations. The journal of wildlife management;JR Sauer,2008