The Niger, a lifeline: Effective water management in the Upper Niger Basin, s. 57. Lelystad, Sévare, Amsterdam, Veenwouden: Rijkswaterstaat, Wetlands International, Institute for Environmental studies, Altenburg & Wymenga ecological consultants, 2005. ISBN 90-807150-6-9Teoksen verkkoversio. (Arkistoitu – Internet Archive)
The Niger, a lifeline: Effective water management in the Upper Niger Basin, s. 57. Lelystad, Sévare, Amsterdam, Veenwouden: Rijkswaterstaat, Wetlands International, Institute for Environmental studies, Altenburg & Wymenga ecological consultants, 2005. ISBN 90-807150-6-9Teoksen verkkoversio. (Arkistoitu – Internet Archive)