Amin, E. A. (1994): Development of grading machine for some Egyptian farm crops. J. Agric. Sci., Mansoura Univ., 19(7):(2398 – 2411).
Anonymous (2003): Design and development of divergent roller type onion grader.Rajgurunagar, Pune. Technical bulletin No. 6.
Anonymous (2004): Agriculture statistics of Pakistan, 2003-04. Federal Bureau of Statistic's Islamabad Pakistan.
Ashraf, M.; S. S. Muhammad; A. Manzoor and Y. Muhammad (2007): Design, development and performance evaluation of fruit and vegetable grader. Pak. J. Agri. Sci., 44(4):704-713.
Dhineshkumar, V. and M. Siddharth (2015): Studies on physical properties of orange fruit. Journal of Food Research and Technology, 3(4):125-130.
Dobrza, S. B. and S. R. Rybczy (2000): A sorting line for uality grading of apple. Zemes KioInzininerija, MoksloDarbai, 32(3):195 – 202.
Jaren, C. and E. Garecia-Pardo (2002): Using non-destructive impact testing for sorting fruits.Journal of food Engineering, 53:89-95.
Mazidi, M., H. Sadrnia and M. Khojastehpour (2016): Evaluation of orange Research Journal, 23(2):899-903.
Ministry of Agricultural and Land Reclamation, Arab Republic of Egypt, Economic Affairs Sector (2013): Bulletin of the agricultural statistics part 12 winter crops 2011/2012.
Mohsenin, N.N., (1986): Physical properties of plant and animal materials. Gordon and Breach Science Publishers, pp 20-89.
Tabatabaeefar, A. and A. Rajabipour (2005): Modeling the mass of apples by geometrical attributes. Sci. Horticultural Journal, 105:373-382.
Topuz, A.; M. Topakci; M. Canakci; I. Akinci and F. Ozdemir (2005): Physical and nutritional properties of four orange varieties. J. Food Eng. Res., 66:519-523.
Yehia, I.; M. H. Kabeel and M. M. Abdel Galeel (2009): Physical and mechanical properties of Mandarin applied to grading machine. Misr J. of Ag. Eng., 26(2):1036-1053.