Brolsma, J.U.; Van Der Graaf, D. (1985). Fluvio-maritime vessels on the river rhine. Bull. Perm. Int. Assoc. Navig. Congr. 49: 50-57
In: Bulletin of the Permanent International Association of Navigation Congresses = Bulletin de l'Association Internationale Permanente des Congrès de Navigation. PIANC/PIANC = AIPCN: Bruxelles. ISSN 0374-1001, meer
