Imannura, P. S. U., U. R. Budhiastuti, and E. Poncorini. “The Effectiveness of Hypnobirthing in Reducing Anxiety Level During Delivery”. Journal of Maternal and Child Health, vol. 1, no. 3, July 2016, pp. 200-4, http://thejmch.com/index.php/thejmch/article/view/29.