Polk, P.; Tack, J. (1994). Sustainable management of East-African mangroves, in: Vanderborght, O. et al. (Ed.) IGBP and 'Global Change' related research in Belgium II. pp. 153-154
In: Vanderborght, O.; Janssens, E. (Ed.) (1994). IGBP and 'Global Change' related research in Belgium II. Royal Belgian Academy of Sciences: Brussel. ISBN 90-6569-609-1. 259 pp., meer