Ertandri, Yodi, et al. “Cortisol Levels in Chronic Primary Dysmenorrhoea Patients and Non-Dysmenorrhoea : A Cross- Sectional Study: Kadar Kortisol Antara Pasien Dismenorea Primer Kronis: Sebuah Studi Potong Lintang”. Indonesian Journal of Obstetrics and Gynecology, vol. 8, no. 2, Apr. 2020, pp. 102-6, doi:10.32771/inajog.v8i2.1128.