Gabriella Tjondro and  Julita Dortua Laurentina Nainggolan,  The Relation between Body Mass Index and Menstrual Cycle Disorders in Medical Students of University Pelita Harapan, Indonesia.   journal   = {International Journal of Medical and Health Sciences}, [online]. World Academy of Science, Engineering and Technology.
    January 2019, vol. 146(2). 50 - 54
    [viewed 21 January 2020]. Available from: https://publications.waset.org/pdf/10010004.