Baanei Heravan, Mahsima, and Sadaf Rashki. “The Relationship of Depression, Anxiety and Stress With Childbirth Self-Efficacy in Nulliparous Pregnant Women : Childbirth Self-Efficacy, Depression, Anxiety and Stress”. Advances in Nursing & Midwifery, vol. 30, no. 2, Apr. 2021, pp. 1-7, doi:10.22037/anm.v30i2.35537.