Late lessons from early warnings: the precautionary principle 1896-2000 (EEA, 2002)
The Precautionary Principle (UNESCO COMEST, 2005)
Communication from the Commission on the precautionary principle (EU, 2000)
In Dutch:
Voorzorg met Rede (Gezondheidsraad, 2008)
Onzekere veiligheid (WRR, 2008)
Nuchter omgaan met risico's (RIVM, 2003)