T. Cunningham, Hubbard, D., Kinahan, J., Kreike, E., Seely, M., Stuart-Williams, V., y Marsh, A.,
Oshanas : sustaining people, environment and development in Central Owambo, Namibia. Windhoek, Namibia: S.n., 1992, p. 56 p.: fig., photogr., map.
S. D. Turner, Bayer, W., Drews, H., Goetze, H., y Marsh, A.,
«Reformulation mission : Ogongo - Okalongo and Oshakati - Omakango water schemes : report». Netherlands, Ministry of Foreign Affairs, DGIS, The Hague, The Netherlands, p. 100 p.: 4 boxes, 5 fig., 6 tab., 1992.
