The common or harbour porpoise (Phocoena phocoena)
Verwey, J.; Wolff, W.J. (1981). The common or harbour porpoise (Phocoena phocoena), in: Reijnders, P. et al. (Ed.) 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: pp. 51-58
In: 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., meer
In: Reports of the Wadden Sea Working Group, meer
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