1. 1. For example see, AlfredWeber, and C. J. Friedrich , Theory of the Location of Industries, (Chicago, 1928 ).
2. R. C. Estall, and R. O. Buchanan, Industrial Activity and Economic Geography (London, 1961 ).
3. BenjaminH. Stevens, and CarolynA. Brackett, Industrial Location (Philadelphia, 1967 ).