1. Product differentiation, monopolistic competition and city size;Abdel-Rahman;Regional Science and Urban Economics,1998
2. Living in the global;Amin,1994
3. Regional Economics and Policy;Armstrong,2000
4. The Role of Civil Society and the Business Community in Rural Restructuring;Atterton,2001
5. Becker, G., 1964. Human Capital: a Theoretical and Empirical Analysis, with Special Reference to Education, Canada.