Sri Yunita Perangin Angin. “The Effect of Anxiety Levels and Coping Mechanism of The Primigravida Against the Length of First Stage of Spontant Labor”. EMBRIO: Jurnal Kebidanan, vol. 12, no. 2, Jan. 2021, pp. 119-28, https://doi.org/10.36456/embrio.v12i2.2877.