Hayati, S., A. Sutoyo, and A. Awalya. “Effectiveness Deep Breathing and Progressive Muscle Relaxation Training (PMRT) Techniques to Reduce Anxiety in Pregnant Woman Pre-Birth”. Jurnal Bimbingan Konseling, Vol. 7, no. 1, Apr. 2018, pp. 48-54, doi:10.15294/jubk.v7i1.22489.