Warnock S.J. (1991) National habitats of lycopersicon species. Hortscienc, 26, 466-471.
 Heuvelink, E. (2005) Tomatoes. Crop production science in Horticulture 13. Wageningen University, Wageningen.
 Ahmed, M.K. (1994) Factors affecting productivity of vegetable crops in Sudan. In: integrated vegetable crop management in Sudan. ICIPE Science Press, Nairobi.
 Abdalla, A.A. and Verkerk, K. (1970) Growth, flowering and fruit set of the tomato at high temperature. Neth. J. Agric. Sci, 16, 71-76.
 Went, F.W. (1956) The experimental control of plant growth. Chrarica Botanic.
 Walthaun, USA.
 Costa. M. and Heuvelink E. (2000) Greenhouse horticulture in Almeria (Spain). Report on a study tour Horticultural production Chains Group, Wageningen University, Wageningen, 24-29 January 2000, 119.
 Hassan, A.A. (1998) Tomato. Production technology and physiology and cultural practices, harvest and storage. Arabic Press House (Arabic).
 Jensen, M.J. and Malter, A.J. (1995) Protected agriculture. A global review. The World Bank, Washington DC.
 Portnee, J. (1996) Greenhouse vegetable production Guide. British Columbia Ministry of Agriculture, Fisheries and Food, Abbots-ford.
 Abdelmageed, A.H.A., Gruda, N. and Geyer, B. (2004) Effects of temperature and grafting on the growth and development of tomato plants under controlled conditions. Deutcher Tropertas 2004-pural poverty.
 Elamin M. H. (2007) Crop water requirements of cucumber (Cucumis sativus L.) under cooled plastic tunnels (M.Sc) Sudan Academy of Sciences, SAS- Agricultural Research Corporation. PP. 52.
 Mohamed. B.M. (1995) Vegetable production in central Sudan. FAO/ARC/IPM Project, Sudan.
 Peet, M. (2007) Tomato Botany. Sustainable practices for vegetable production in South. Crop Profiles-Tomato.
 Hochmuth, G.J. (2007) Production of greenhouse tomatoes. Florida greenhouse vegetable production handbook. University of Florida, Gainesville