K. E. Internatio Nairobi,
«Raindrop». International Rainwater Catchment Systems Association, Nairobi, Kenya.
A. Appan, Wing, L. Kam, y Latham, B.,
Rainwater catchment : status and research priorities in the Southeastern Asian region : proceedings of the regional seminar and workshop held in Khon Kaen, Thailand, 29 November to 3 December 1983, vol. 127e. Ottawa, Ont, Canada: International Development Research Centre (IDRC).
N. L. Royal Hask Nijmegen,
«Range». Royal Haskoning, Nijmegen, The Netherlands.