Web MD. https://www.webmd.com/women/guide/cramps-but-no-period#1-3
Diakses pada 13 Februari 2020
Medical News Today. https://www.medicalnewstoday.com/articles/322929.php#inflammatory-bowel-disease-ibd
Diakses pada 13 Februari 2020New Doctor. https://www.netdoctor.co.uk/conditions/digestive-health/a11617/lower-abdominal-pain-in-women/
Diakses pada 24 September 2020Center for Young Women's Health. https://youngwomenshealth.org/2013/02/21/pelvic-inflammatory-disease/
Diakses pada 24 September 2020