1. Gynecology: Principles and Practice;Kistner,1971
2. Down's Anomaly;Penrose,1966
3. Techniques and Risk of Amniocentesis;Jacobson,1972
4. The Role of Amniotic Fluid Analysis;Werch;JOGN Nurs,1974
5. Causes and Prenatal Diagnosis of Congenital Abnormalities;Persaud;JOGN Nurs,1974