1. Bonn Agreement (1993) Oil Pollution at Sea – Securing Evidence on Discharges from Ships. Manual, 56 pp
2. Camphuysen, C. J. (1989) Olieslachtoffertellingen aan de Nederlandse kust 1915–1988, Zeevogelsterfte in de zuidelijke Noordzee sinds het begin van de olievervuiling. Technisch rapport Vogelbescherming 2, Werkgroep Noordzee, Amsterdam, The Netherlands, 21 pp
3. Camphuysen, C. J. (1998) Beached bird surveys indicate decline in chronic oil pollution in the North Sea. Marine Pollution Bulletin 36, 519–526
4. Clark, R. B. (1992) Marine Pollution. Clarendon Press, Oxford, 172 pp
5. Dahlmann, G., Timm, D., Averbeck, C., Camphuysen, C., Skov, H. and Durinck, J. (1994) Oiled seabirds – comparative investigations on oiled seabirds and oiled beaches in the Netherlands, Denmark and Germany (1990–1993). Marine Pollution Bulletin 28, 305–310