Klein Goldewijk, K. , A. Beusen, M. de Vos and G. van Drecht (2011). The HYDE 3.1 spatially explicit database of human induced land use change over the past 12,000 years, Global Ecology and Biogeography20(1): 73-86. doi:10.1111/j.1466-8238.2010.00587.x (pbl.nl).
Jean-Noël Biraben, "Essai sur l'évolution du nombre des hommes", Population 34-1 (1979), 13-25 (p. 22) estimates c. 80 million in 2000 BC and c. 100 million at 1200 BC.
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Klein Goldewijk, K. , A. Beusen, M. de Vos and G. van Drecht (2011). The HYDE 3.1 spatially explicit database of human induced land use change over the past 12,000 years, Global Ecology and Biogeography20(1): 73-86. doi:10.1111/j.1466-8238.2010.00587.x (pbl.nl).
Jean-Noël Biraben, "Essai sur l'évolution du nombre des hommes", Population 34-1 (1979), 13-25 (p. 22) estimates c. 80 million in 2000 BC and c. 100 million at 1200 BC.
