1. Edwards, C.A. (1998).Use of earthworms in breadown and management of organic wastes. In: Edwards. C.A. (Ed.) Earthworm ecology. CRC Press LLC, Boca Raton, Florida. pp. 327–354.
2. Fatma, E.M., El-Zamik, I., Tomader, T., El-Hadidy, H.I. Abd El-Fattah, L. and Seham Salem, H. (2006).Efficiency of biofertilizers, organic and in organic amendments application on growth and essential oil of marjoram (Majorana hortensisL.) plants grown in sandy and calcareous. Agric. Microbiology Dept., Faculty of Agric., Zagazig University and Soil Fertility and Microbiology Dept., Desert Research Center, Cairo, Egypt .
3. Hornok, L., Csaki, G.Y., Varga, E., Ghanem, S.A. and Halasz, M. (1990).Effect of some cultivation factors on production of medicinal plants. Proceeding of the 2nd Arab Conference on Medicinal Plant, Cairo, Egypt. January 1990 .
4. Kalra, A. (2003).Organic cultivation of medicinal and aromatic plants. A hope for sustainability and quality enhancement. Journal of Organic Production of Medicinal, Aromatic and Dye-Yielding Plants (MADPs). FAO. 198p .
5. Omidbaigi, R. (2005).Production and Processing of Medicinal Plants. 1th Ed. The Behnashr Press. 438 pp.