7Gereffi, G., 1999, "International Trade and Industrial Upgrading in the Apparel Commodity Chain", Journal of International Economics, 48, pp.37-70.
8Hobbs, Jill E., Linda M. Young, 2001, "Vertical Linkages in Agri-Food Supply Chains in Canada and the United States", Research and Analysis Directorate, Strategic Policy Branch, Agriculture and Agri-Food Canada.
9Hobbs, Jill E., Linda M. Young, 2002, “Vertical Linkages in Agri-Food Supply Chains: changing Roles for Producers, Commodity Groups, and Government Policy”, Review of Agricultural Economics, Volume 24, Number 2, pp.428-441.
10Humphrey, John, 2005, “Shaping Value Chains for Development: Global Value Chains in Agribusiness”,GTZ Trade Programme ,http://www.ids.ac.uk
