Maandag H., Hummel H. 1999: Fishstocks in the Oosterschelde (The Netherlands), period 1983-1990 & August 1999. Netherlands Institute of Ecology; Centre for Estuarine and Marine Ecology, Netherlands. Metadata available at http://mda.nioo.knaw.nl/imis.php?module=dataset&dasid=1090, more
Maandag, H. (1999). Visstand in de Oosterschelde - augustus 1999. Graduate Thesis. Hogeschool Zeeland: Yerseke. 18 pp., more
Maandag, H. (Ed.) (1999). Densiteit van demersale vissoorten in de Oosterschelde periode 1983-1990. Graduate Thesis. Hogeschool Zeeland: Yerseke. 34 pp., more
