Karina Costa
Costa, Karina, and Peter M. Groffman. 2013. “Factors Regulating Net Methane Flux By Soils In Urban Forests And Grasslands”. Soil Science Society Of America Journal 77 (3): 850. doi:10.2136/sssaj2012.0268n.
Costa, Karina. 2009. “Factors Regulating Net Methane Flux In Urban Forests And Grasslands”. Undergraduate Ecology Research Reports. Millbrook, New York: Cary Institute of Ecosystem Studies. http://www.caryinstitute.org/reprints/Costa_2009_REU.pdf.