Marine mammals of the Wadden Sea: Final report of the section 'Marine Mammals' of the Wadden Sea Working Group
Reijnders, P.; Wolff, W.J. (Ed.) (1981). Marine mammals of the Wadden Sea: Final report of the section 'Marine Mammals' of the Wadden Sea Working Group. Reports of the Wadden Sea Working Group, 7. Stichting Veth tot Steun aan Waddenonderzoek: Leiden. ISBN 90-6191-057-9. 64 pp.
Deel van: Reports of the Wadden Sea Working Group, meer
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