Khunamornpong, Surapan, and Sumalee Siriaunkgul. 1995. “Histologic Types of Ovarian Tumors in Maharaj Nakorn Chiang Mai Hospital”. Thai Journal of Obstetrics and Gynaecology 7 (1). Bangkok, Thailand:41-49. https://he02.tci-thaijo.org/index.php/tjog/article/view/257765.