Forrester, J.W. (1969). Urban dynamics. Cambridge Mass. : MIT Press.
2.
Keyfitz, W. (1968). Introduction to the mathematics of population . Addison Wesley.
3.
Rees, P.H. and Wilson, A.G. (1975). Accounts and models for spatial demographic analysis 3: rates and life tables. Environment and Planning, Vol. 7, No. 2. London: Pion.
