1. The graphic analysis of labor;Friedman;Am J Obstet Gynecol,1954
2. Labor: clinical evaluation and management;Friedman,1978
3. Management of labor,1989
4. Primigravid labor: a graphicostatistical analysis;Friedman;Obstet Gynecol,1955
5. Friedman EA, Neff RK, editors. Pregnancy hypertension: a systematic evaluation of clinical diagnostic criteria. 2nd ed. National Institute of Neurological and Communicative Disorders and Stroke; New York, NY: Raven Press Publishers; 1988.