Aldrish,A.R.and Bartok.W.J.(1994).greenhouse engineering. NRASE-33-3rd edition
BATU, A. (1998). Some factors affecting on determination and measurement of tomato firmness. Tr. J. of agriculture and forestry 22(1998) 411-418.
Buffington, D.E.; Bucklin, D.A.; Henley, R.W. and Mc Connell, D.B. (2002). Fans for greenhouses, institute of food and agriculture science, university of Florida AE-12
Gao,Z.(2012).Dehumidification of greenhouses in cold regions. Thesis, degree of, Sc, Uni. of Saskatchewan.
Jackman, R. L., A. G. Marangoni and Stanely, D. W. (1990). Measurement of tomato fruit firmness, Hort Science. 25(7):781-783.
Rajabipour,A.(1995).Effects of Ca, K and water table depth on tomato mechanical properties; PhD thesis, McGill Univ. MacDonald campus.
Shafiee, s; Motlag,A.M; Didar,R.A., and Minaee,s.(2008). Investigation the effect of skin on mechanical behavior of apple, journal of food technology 6(2):86-91, 2008.ISSN:1684-8426.
Sirisomboon,P. ; Tanaka,M. ; Kojima,T. and William,P. (2012). Nondestructive estimation of maturity and textural properties on tomato ‘momotaro’ by near infrared spectroscopy. Journal of Food Engineering 112 (2012) 218-226.
Li, Z.; Li,P.; and Liu, J. (2011), Physical and mechanical properties of tomato fruits as related to robot’s harvesting. Journal of food engineering 103 (2011) 170- 178.