1. Andreev, A., 1996. The Political Change and Political Parties, in: I. Zloch-Christy, ed., Bulgaria in a Time of Change. Aldershot: Avebury, 25–44.
2. Baker, S., 1996. The Scope for East-West Co-operation, in: A. Blowers, and P. Glasbergen (eds.), Environmental Policy in an International Context: Prospects, Vol. 3. London: Arnold, 135–65.
3. Baker, S., and P. Jehlicka, 1998. Dilemmas of Transition: The Environment, Democracy and Economic Reform in East Central Europe: an Introduction, in: S. Baker and P. Jehlicka (eds.), Dilemmas of Transition: The Environment, Democracy and Economic Reform in East Central Europe. London: Frank Cass, 1–26.
4. Baker., S and B. Baumgartl, 1998, Bulgaria: Managing the Environment in an Unstable Transition, in: S. Baker and P. Jehlicka (eds.), Dilemmas of Transition: The Environment, Democracy and Economic Reform in East Central Europe. London: Frank Cass, 183–206.
5. Biodiversity Support Programme, 1994, Conserving Biological Diversity in Bulgaria: The National Biological Diversity Conservation Strategy. Washington: Biodiversity Support Programme.