1. Placental steroid hormone biosynthesis in primate pregnancy;Albrecht;Endocrine Reviews,1990
2. Anonymous. (1989). Multicentric trial of chorionic villus sampling and amniocentesis in prenatal diagnosis. Research in Reproduction, 21(2), 1–2.
3. Reproduction in Mammals, Book 2, Embryonic and Fetal Development,1982
4. Reproduction in Mammals, Book 3, Hormonal Control of Reproduction,1984
5. The placenta;Beaconsfield;Scientific American,1980