Everyday Health. https://www.everydayhealth.com/gerd/gerd-and-scleroderma.aspx
Diakses pada 9 September 2020Healthline. https://www.healthline.com/health/gerd
Diakses pada 9 September 2020Mayo Clinic. https://www.mayoclinic.org/diseases-conditions/gerd/symptoms-causes/syc-20361940
Diakses pada 9 September 2020Verywell Health. https://www.verywellhealth.com/what-causes-gerd-1741914
Diakses pada 9 September 2020