Cancer.net
https://www.cancer.net/cancer-types/brain-tumor/introduction
https://www.cancer.net/cancer-types/brain-tumor/risk-factors
diakses 29 Juli 2020The Breast Cancer Charities
https://thebreastcancercharities.org/10-cancer-causing-foods/
Diakses 29 Juli 2020Healthline
https://www.healthline.com/health/brain-cancer#prevention
Diakses 29 Juli 2020