1. Williams obstetrics;Cunningham,1997
2. Thompson & Thompson: genetics in medicine;Thompson,1991
3. Questionnaire vs. Pedigree;French;Birth Defects,1990
4. Genetic counseling before prenatal diagnosis for advanced maternal age: an important medical safeguard;Rubin;Obstet Gynecol,1983
5. Obstetricians attitudes toward genetic screening;Gardis;Am J Public Health,1977