1. WARKANY, J. Drugs and teratology, p. 132. In: Pediatric Therapy (4th ed.) Shirkey, H.C. (ed.), C. V. Mosby Co., St. Louis, Mo. 1972.
2. WILSON, J.G. AND WARKANY, J. Editors. Teratology: principles and techniques. Chicago, 1965, University of Chicago Press.
3. Ibid. p. 185.
4. EDITORIAL. Brit. Med. J. 1: 642, 1970.
5. DIPAOLO, J.A. KOTIN, P. Arch. Path. 81: 3, 1966.