Khodair، A. A.، Elwan، S. H.، و Helemish، F. (1982). Physiological Studies on Modifying the Effects of Sodium ion Up Take on the Assimilation of Molecular Nitrogen by Azotobacter Chroococcum: III - The role of Cyanocobalamin (B12) Supplementation. مجلة كلية التربية، ع8 ، 93 - 107. مسترجع من http://search.mandumah.com/Record/655283
Khodair، A. A.، S. H. Elwan، و F. Helemish. "Physiological Studies On Modifying the Effects of Sodium Ion Up Take On the Assimilation of Molecular Nitrogen By Azotobacter Chroococcum: III - The Role of Cyanocobalamin (B12) Supplementation." مجلة كلية التربية ع8 (1982): 93 - 107. مسترجع من http://search.mandumah.com/Record/655283