1. Byskov AG. Differentiation of the mammalian embryonic gonad. Physiol Rev 1986; 6671–117.
2. Hamilton WJ, Mossman HW, eds. Human embryology; prenatal form and function. 4th ed. Cambridge: Heffer, 1972.
3. Pierce GB, Shikes R, Fink LM. Cancer, a problem of developmental biology. Englewood Cliffs: Prentice Hall, 1978.
4. Pierce GB. Neoplastic stem cells. In: Borek C, Fenoglio CM, King DW, eds. Cancer biology. IV. Differentiation and carcinogenesis. New York: Stratton Intercontinental Medical, 1977.
5. Rubin E, Farber JL. Neoplasia. In: Pathology. Philadelphia: WB Saunders, 1988.