«AID-UNC/IPSED Series». University of North Carolina at Chapel Hill, School of Public Health, Chapel Hill, NC, USA.
«Akzente : GIZ Magazine». Deutsche Gesellschaft fur Internationale Zusammenarbeit, GIZ, Bonn, Germany.
«American journal of tropical medicine and hygiene». American Society of Tropical Medicine and Hygiene, Deerfield, Illinois.
K. E. A. M. R. E. F. - Nairobi,
«AMREF news». African Medical and Research Foundation (AMREF), Nairobi, Kenya.
A. Schmeulling y Getfert, W.,
«The amusing journey of the waterdrops». Vereinigung Deutscher Gewasserschutz e. V., Bonn, Germany, p. 16 p. : ill.