Drews, H.

Turner, S.D. et al., 1992. Reformulation mission : Ogongo - Okalongo and Oshakati - Omakango water schemes : report, The Hague, The Netherlands: Netherlands, Ministry of Foreign Affairs, DGIS. Available at: https://www.ircwash.org/sites/default/files/824-NAOW92-12184.pdf.