EL-Raie, A. E. S.; N. A. Hendawy and A. A Taib (1996). Study of physical and engineering properties for some agriculltural products. Misr J. Ag. Eng., 13 (1) 211-226.
Buyanov, A. I. and B. A. Voronyuk (1985). Physical and Mechanical Properties of Plants, Fertillizer and Soils. Amerind publishing Co. pvT. LTD. New Delhi-Bombay- Calcuta. New York.
Zaalouk, A. K. (1994). Sugar beet harvesting mechanization, M. Sc. Thesis, Fac. of Agric., Al-AzharUniv.