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2. Itinéraires botaniques en Afrique occidentale;Adam;Journ. Agric. Trop, et Bot. Appl.,1962
3. Vegetationsbilder aus Russisch-Turkestan;Bessey,1905
4. Vegetationsbilder vom Nordrand der algerischen Sahara;Brockmann-Jerosch,1908
5. A key to Raunkiaer plant life forms with revised subdivisions;Ellenberg;Ber. Geobot. Inst. ETH Rübel,1965