Health Hub Singapore. https://www.healthhub.sg/live-healthy/800/Heaty-and-cooling-09Nov2015-NHG
Diakses pada 25 November 2019Healthline. https://www.healthline.com/health/sore-throat
Diakses pada 25 November 2019Mayo Clinic. https://www.mayoclinic.org/diseases-conditions/canker-sore/symptoms-causes/syc-20370615
Diakses pada 25 November 2019