Ahmed, A. , Amar, A. , I., D. , Taha, R.. "Indirect Regeneration and Somatic Embryogenesis from Leaf and Stem Explants of Crassula ovata (Mill.) Druce – An Ornamental Medicinal Plant". World Academy of Science, Engineering and Technology, Open Science Index 96, International Journal of Biomedical and Biological Engineering, (2014), 8(12), 1310 - 1313.