Wissenschaftliche Berichte / FZKA. 7361 : Fuels and chemicals from rice straw in Egypt / R. Stahl, A. B. Ramadan, 2007. - 70 p. с. - Текст : непосредственный.
Wissenschaftliche Berichte / FZKA. 7427 : Environmental studies on water quality of the Ismailia Canal/ Egypt / R. Stahl, A. B. Ramadan, 2008. - V, 47 p. с. - Текст : непосредственный.
NATO science series.Sub-ser. IV, Earth and environmental sciences. Vol. 38 : Comparative risk assessment and environmental decision making : Proc.of the NATO advanced research workshop on comparative risk assessment and environmental decision making, Roma 13-16 Oct. 2002 / , 2004. - XI, 435 p. - Текст : непосредственный.
Stahl R. Bahr El-Baqar Drain system/Egypt environmental studies on water quality. Pt. 1 : Bilbeis Drain/Bahr El-Baqar Drain, 2009. - 39 p. с. - Текст : непосредственный.