What to Expect. https://www.whattoexpect.com/pregnancy/symptoms-and-solutions/abdominal-cramps.aspx
Diakses pada 24 Desember 2020Healthline. https://www.healthline.com/health/pregnancy/cramps
Diakses pada 24 Desember 2020Mayo Clinic. https://www.mayoclinic.org/healthy-lifestyle/pregnancy-week-by-week/in-depth/pregnancy/art-20047732
Diakses pada 24 Desember 2020Postgraduate Medicine. https://pubmed.ncbi.nlm.nih.gov/25526231/
Diakses pada 26 Januari 2021