Hassanein، R. A.، و Hassanein، A. A. (1981). Changes in The Metabolism and The Growth Regulators of the Cotyledonary Leaves of Ricinus Communis During Senescence. مجلة كلية التربية، مج4, ع2 ، 281 - 305. مسترجع من http://search.mandumah.com/Record/668781
Hassanein، Raifa A.، و Amira A. Hassanein. "Changes in The Metabolism and The Growth Regulators of the Cotyledonary Leaves of Ricinus Communis During Senescence." مجلة كلية التربية مج4, ع2 (1981): 281 - 305. مسترجع من http://search.mandumah.com/Record/668781