WebMD. https://www.webmd.com/back-pain/understanding-back-pain-symptomsMayo Clinic. https://www.mayoclinic.org/diseases-conditions/back-pain/symptoms-causes/syc-20369906Diakses pada Oktober 2018NIH. https://www.ninds.nih.gov/disorders/patient-caregiver-education/fact-sheets/low-back-pain-fact-sheet
Diakses pada 23 Oktober 2020