1. Ahenkan A, Boon E 2008. Enhancing food security, poverty reduction and sustainable forest management in Ghana through Non-Timber Forest Products farming: Case study of Sefwi Wiawso District, published online by GRIN Publishing at www.grin.com/de/preview/.html (Retrieved August, 8, 2010)
2. Anderson AB 1990. Extraction and forest management by rural inhabitants in the Amazon estuary, In: AB Anderson (Ed.):Alternatives to Deforestation: StepsTowards Sustainable Use of the Amazon Rain Forest. New York: Columbia University Press, pp. 65–85.
3. Arnold JEM, Ruiz Perez M 1998. The role of non-timber forest products in conservation and development. In: E Wollenberg, A Ingles (Eds.):Incomes from the Forest: Methods for the Development and Conservation ofForest Products for Local Communities. Bogor, Indonesia: CIFOR / IUCN, pp. 17–42.
4. Belcher B, RuizPérez M 2001. An international comparison of cases of forest product development: overview, description and data requirements.Center for International Forestry Research (CIFOR) Working Paper 23. Bogor, Indonesia: CIFOR.
5. Bih F 2008.Assessment Methods for Non-Timber Forest Products in Off-Reserve Forests. Case Study of Goaso District, Ghana. PhD Thesis. Freiburg, Germany: der Albert-Ludwigs-Universität.