C.S. Swan
Pickett, Steward T. A., G.S. Brush, A. J. Felson, Brian McGrath, Morgan Grove, C.H. Nilon, K. Szlavecz, C.S. Swan, and P. Warren. 2012. “Understanding and Working With Urban Biodiversity: The Baltimore Ecosystem Study”. CityGreen 4: 68-77. http://www.caryinstitute.org/reprints/Pickett_CityGreen_2012.pdf.