York, R., E. A. Rosa, and T. Dietz. “A Tale of Contrasting Trends: Three Measures of the Ecological Footprint in China, India, Japan, and the United States, 1961-2003”. Journal of World-Systems Research, vol. 15, no. 2, Aug. 2009, pp. 134-46, doi:10.5195/jwsr.2009.319.