8John Kennell MD, Marshall Klaus MD, Susan MG.Continuous emo- tional support during labor in a US hospital. JAMA, 1991,265 : 2197- 2201.
9Regina P, Lederman RN. Anxiety and epinephrine in multi - parous women in labor:relationship to duration of labor and fetal heartrate pattern.AM J Obstet Gynecol, 1985,15 : 870- 876.
6Lothian JA.Lamaze breathing:what every pregnant woman needs to know[J].J Perinat Educ, 2011,20(2) : 118-120.
7Tournaire M,Theau-Yonneau A.Complementary and alter- native approaches to pain relief during labor[J].Evid Based Complement Alternat Meal,2007,4(4):409-417.