Kamonmooneechote, Tatchai, Srinaree Kaewrudee, Sukree Soontrapa, Chompilas Chongsomchai, Bandit Chumworathayi, and Teerayut Temtanakitpaisan. 2014. “Menstrual Patterns among Upper Secondary School Students, Khon Kaen, Thailand”. Thai Journal of Obstetrics and Gynaecology 22 (1). Bangkok, Thailand:52-58. https://he02.tci-thaijo.org/index.php/tjog/article/view/12936.