Berry, B.J.L., Simmons, J.W. and Tennant, R.J. (1963). Urban population densities: structure and change . Geographical Review, Vol. 53: 389-405.
2.
Berry, B.J.L. (1967). Research frontiers in urban geography. The Study of Urbanization. Edited by P. M. Hauser and L. F. Schnore.New York: John Wiley. 403-30.
3.
Blalock, H.M. (1961). Causal Inferences in Non-experimental Research . Chapel Hill: University of North Carolina Press.
4.
Casetti, E. (1969). Alternate urban population density models: an analytical comparison of their validity range. Studies in Regional Science . Edited by A. J. Scott.London: Pion Ltd.
5.
Clark, C. (1951). Urban population densities. Journal, Royal Statistical Society, Series A, 114: 490-96.
6.
Dominion Bureau Of Statistics (Dbs) (1963). Census tract data: Hamilton. Census of Canada, 1961, CT26-6-1963, Queen's Printer: Ottawa.
7.
Efroymson, M.A. (1960). Multiple regression analysis. Mathematical Methods for Digital Computers. Edited by A. Ralston and H. S. Wilf.New York: John Wiley.
8.
Latham, R.F. and Yeates, M.H. (1970). Population density growth in metropolitan Toronto . Geographical Analysis, 2: 177-85.
9.
Mercer, J. (1968). Density decline surfaces in urban areas. The Canadian Geographer, 12: 158-75.
10.
Papageorgiou, G. (1971). A theoretical evaluation for the existing population density gradient functions. Economic Geography, 47: 21-6.
11.
Reinhardt, F.R. (1950). A test of hypotheses specifically related to the cross-sectional distribution of population densities in cities. Unpublished M.A. thesis, Department of Sociology, University of Minnesota.
12.
Sibley, D. (1970). Density gradients and urban growth. UrbanStudies, 7: 294-7.
13.
Taitel, M. (1960). On problems of measuring the distribution of population in an urban area. American Statistical Association Proceedings, 55.