المراجع الأجنبية
- Chakrabarty, A. (١٩٨٥) . Gentic Engineering Fith. ed. CrC. press.
- Gasser, C. and Fraley, R. (١٩٩٢) . Transgenic Crops. Scientific American, june.
- Larsen, W. (١٩٩٣) . Human Euman Embryology. Churchill.
Livingstone. Newyork.
- Lewin, B. (١٩٩٠) Genes IV. Oxford Cell press.
- Verna, I. (١٩٩٠) . Gene Therpy, Scientific American. November.
٦٨-٨٤.
- Waddington, C (١٩٥٦) . principles Of embryology. the Macmillan Company, newyork.
المجلات والجرائد:
- Newsweek, March ١٠, ١٩٩٦٧.
- Nature, Feb ٢٧, ١٩٩٧.
- Science, November, ١٩٨٥.