Heilig, G.K. <https://pure.iiasa.ac.at/view/iiasa/1318.html>  (1996).  Who is changing the land? Lifestyles, population, and global land-use change.    In:  Population Growth and Environmental Issues. Eds. Ramphal, S. & Sinding, S.W.,  London: Praeger Publishers.  ISBN 0-275-95371-8