1. Quilligan EJ, Little AB, Oh W, et al: Pregnancy, Birth and the Infant. Washington, US Department of Health and Human Services, Public Health Services, National Institutes of Health, 1981, p. II–6
2. Editorial: Treatment of moderate hypertension in pregnancy. Br Med J 280: 1483–1484, 1980
3. Hughes EC (ed): Obstetric-Gynecologic Terminology. Philadelphia, FA Davis, 1972, pp 442–423
4. Eastman NJ, Bell ET, Dieckmann WJ, et al: Definition and Classification of Toxemias Brought Up-to-Date. Chicago, American Committee on Maternal Welfare, 1952
5. Friedman EA (ed): Blood Pressure, Edema and Proteinuria in Pregnancy. New York, Alan R Liss, 1976, pp 123–151