WebMD. https://www.webmd.com/heartburn-gerd/indigestion-overview#1
Diakses pada Mei 2019Medical News Today. https://www.medicalnewstoday.com/articles/312964.php
Diakses pada Mei 2019Mayo Clinic. https://www.mayoclinic.org/diseases-conditions/heart-attack/symptoms-causes/syc-20373106
Diakses pada Mei 2019Web MD. https://www.webmd.com/heart-disease/features/never-ignore-symptoms#1
Diakses pada Mei 2019American Heart Association. https://www.heart.org/en/health-topics/heart-attack/warning-signs-of-a-heart-attack/heart-attack-symptoms-in-women
Diakses pada Mei 2019