1Illersis, S. and Philippe, J. ,1993, "Introduction: The Role of Services in Regional Economic Growth", Service Indus- tries Journal,13(2) :3-10.
2Marshall, A. , 1890/1961, Principles of Economics: An Introductory Volume, 9th ed. , London: Macmillan.
3Jacobs, J. , 1969, The Economy of Cities, New York : Vintage.
4Glaeser, E. L. , Kallal, H. D. , Schcinkman, J. A. , et al. ,1992, "Growth in Cities", The Journal of Political Econo- my, 100(6) :1126-1152.
5Eswaran, M. and Kotwal, A. ,2002, "The Role of Service in the Process of Industrialization", Journal of Development E- conomics ,68 ( 2 ) :401--420.
6Wood, P. ,2006, "Urban Development and Knowledge-intensive Business Services: Too Many Unanswered Questions? ", Growth and Change,37(3) :335-361.
7Aslesen, H. W. and Isaksen, A., 2007, " New Perspectives on Knowledge-intensive Services and Innovation ", Geografiska Annaler : Series B, Human Geography,89( 1 ) :45-58.
8Bryson, J. R. , Taylor, M. and Daniels, P. W. ,2008, "Commercializing Creative Expertise: Business and Professional Services and Regional Economic Development in the West Midlands, UK", Politics and Policy,36 (2) .306-328.
9Feser, E. J. ,2002, "Tracing the Sources of Local External Economies", Urban Studies,39 ( 13 ) :2485-2506.
10Combes, P. P. ,2000, "Economic Structure and Local Growth: France,1984 - 1993", Journal of Urban Economics,47 (3) :329-355.
