1. Beveridge, E and Nott, S. (1998) 'A hard look at soft law', in R Craig and C. Harlow (eds), Law Making in the European Union, The Hague: Kluwer Law International.
2. Brittan, L. (1989) 'A bonfire of subsidies', European Access 2.
3. Commission of the European Communities (1990) Nineteenth Report on Competition Policy Luxembourg: Office of Official Publications.
4. Dehousse, R. and Weiler, J.H.H (1990) 'EPC and the Single Act: from soft law to hard law? European University Institute Working Paper, European Policy Unit, EPU No. 90/1.
5. della Cananea, G. (1993) 'Administration by guidelines: the policy guidelines of the Commission in the field of state aids', in I. Harden (ed.), State Aid: Community Law and Policy, Cologne: Bundesanzeiger.