Elvidge C., Sutton P. C., Wagner T. W., Vogelmann J. E., Goetz S. J., Smith A. J., Jantz C., Seto K. C., Imhoff M. L., Wang Y. Q., Milesi C. & Nemani R. (2004) Chapter 18: Urbanization. In: Land Change Science: Observing, Monitoring, and Understanding Trajectories of Change on the Earth's Surface (ed. Gutman) pp. 315-328. Kluwer Academic Publishers, Dordrecht, The Netherlands.