1. Adair, J. (1996) Effective Innovation. Pan Books, London
2. Brodhead, T. (1987) NGOs: In one year, out the other? World Development 15, 1–6
3. Brown, D. and Korten, D. (1989) Understanding voluntary organizations: guidelines for donors. Policy, Planning and Research Working Papers No. WPS 258, World Bank, Washington, DC
4. Downs, G. and Mohr, L. (1976) Conceptual issues in the study of innovations. Administrative Science Quarterly 21, 700–714
5. Drucker, P. F. (1994) Managing the Non-profit Organization. Butterworth-Heinemann, Oxford