1. BASS, R., BECK, F., MERKER, H.-J., NEUBERT, D. & RANDHAHN, B. (eds) (1970). Metabolic Pathways in Mammalian Embryos during Organogenesis and Its Modification by Drugs, pp. 633, Berlin: Freie Universität.
2. BORÉUS, L.D. (ed.) (1973). Fetal Pharmacology, pp. 487, New York: Raven Press.
3. BRENT, R.L. (1982). The importance and magnitude of the prevention of congenital malformations. In Proceedings, World Conference on Prevention des anomalies congénitales physiques et mentales, Strassbourg.
4. ELWOOD, J.M. & ELWOOD, J.H. (1980). Epidemiology of Anencephalus and Spina Bifida. Oxford: Oxford University Press — cited by Warkany.
5. EPA (1982). Assessment of Risks to Human Reproduction and to Development of the Human Conceptus from Exposure to Environmental Substances. Proceedings of EPA Sponsored Conferences, Atlanta and St Louis 1980, pp. 158, Oak Ridge Nat. Laboratory.