1. Chapman, G. P. (1974): Perception and regulation: a case study of farmers in Bihar. Transactions of the Institute of British Geographers, 62, 71-93.
2. Hart, P. W. E. (1978): Geographical aspects of con-tract farming, with special reference to the supply of crops to processing plants. Tijdschrift voor Econ. en Soc. Geografie, 69, 205-215.
3. Kellerman, A. (1978): Determinants of rent from agricultural land around metropolitan areas. Geogr. Analysis, 10, 1-12.
4. Munton, R. J. C. (1969): The economic geography of agriculture. Cooke, R. U. and Johnson, J. H. ed: Trends in Geography: An Introductory Survey. Pergamon Press, Oxford, 143-152.
5. Pred, A. R. (1967): Behavior and location: foun-dations for a geographic and dynamic location theory: Part I. Lund Studies in Geography, 27(B), C. W. K. Gleerup, Lund, 128p.