1. Ali, A. F.M. 1979, Faculty of Science, Aswan, Assiut University, Egypt, Rizk, A. M. 1986, The Phytochemistry of the Flora of Qatar, The Scientific and Applied Research Centre, University of Qatar, Richmond, Great Britain, King-print
2. Nutrient evaluation of some arid range plants in Saud Arabia;Al-Jaloud;Journal of Arid Environment,1994
3. Chemical Analysis of Ecological Materials;Allen,1989
4. Factors within plant associations affecting the behaviour and performance of grazing animals;Arnold,1964
5. Analytisch-chemische Untersuchung des Kaliummanglesbei Chlorella in Vergleich mit anderen Mangelzustanden;Badour,1959