1. Bargmann, W.: Histologie und mikroskopische Anatomie, 2. Aufl. Stuttgart: Georg Thieme 1956.
2. Edmudns, H. W.: Pituitary, adrenal and thyroid in cyclopia. Arch. of Path. 50, 727 (1950).
3. Flint, J. M.: The blood-vessels, angiogenesis, organogenesis, reticulum and histology of the adrenal. Johns Hopkins Hosp. Rep. 9, 153 (1900).
4. Forbes, Th. R.: Studies on the reproductive system of the alligator. IV. Observations of the development of the gonad, the adrenal cortex and the Mülleran duct. Contrib. to Embryol. 28, 157 (1940).
5. Jost, A.: The age factor in the castration of the male rabbit fetuses. Proc. Soc. Exper. Biol. a. Med. 66, 302 (1947).