Berry, J.L.B. and Pred, A. (1961). Central Place Studies: a Bibliography of Theory and Applications. Philadelphia, Regional Science Research Institute.
2.
Campbell, T. (1965). Variation and Selective Retention in Socio-cultural Evolution. In Barringer, H. R. (Ed.), et al., Social Change in Developing Areas. Cambridge, Mass., Schenkman Pub. Co.
3.
Christaller, W. (1933). Die Zentralen Orte in Suddeutschland. Jena, Gustav Fisher Verlag.
4.
Duncan, O.D. et al. (1960). Metropolis and Region. Baltimore, Johns Hopkins University Press.
5.
Dunn, E.S., JR. (1954). The Location of Agricultural Production. Gainesville, University of Florida Press .
6.
- (in press). Economic and Social Development: a Process of Social Learning. Baltimore, Johns Hopkins University Press .
7.
Haggett, P. (1967). Network Models in Geography. In Chorley, Richard J. and Haggett, Peter (Eds.), Models in Geography. London, Methuen.
8.
Hoover, E. (1968). The Evolving Form and Organization of the Metropolis . In Perloff, H. and Wingo, L., Issues in Urban Economics . Baltimore, Johns Hopkins University Press.
9.
Losch, A. (1954). The Economics of Location, translated by Stolper, W. F. New Haven, Yale University Press.
10.
Ore, O. ( 1967). Graphs and Their Uses. New York, Random House, New Mathematical Library.
11.
Stevens, B.H. and Brackett, C.A. (1967). Industrial Location: a Review and Annotated Bibliography . Philadelphia, Regional Science Research Institute.
12.
Weber, A. (1929). Theory of Location of Industries, ed. by C. J. Friedrich.Chicago , University of Chicago Press.
