1. Archibald, C. G. M., 1966. Some new and interesting cyanophytes from the Kowie river system in the eastern Cape Province (South Africa). Nova Hedwigia 12: 429?538.
2. Archibald, C. G. M., 1967. New and interesting cyanophytes from the Kowie river system in the eastern Cape Province (South Africa). II. Nova Hedwigia 13: 389?395.
3. Biggs, B. J. F. & G. M. Price, 1987. A survey of filamentous algal proliferations in New Zealand rivers. N.Z. J. Mar. & Freshwat. Res. 21: 175?191
4. Braun, A., 1868. Die Characeen Africas. Monatsb. d. K�nigl. Akad. Berlin: 782?872.
5. Bruwer, C. A., 1980. Aksieplan vir die ontwerp van `n beheerstrategie teen die oormatige groei van Cladophora in besproeiingskanale. Report BC:001 for the Department of Water Affairs, Forestry and Environment, Pretoria, 7 pp.