- http://www.cancercenter.com/breast-cancer
- http://www.cdc.gov/cancer/breast/basic_info/risk_factors.htm
- https://www.cancer.org/cancer/breast-cancer-in-men/causes-risks-prevention/prevention.html
- https://www.cdc.gov/cancer/breast/pdf/breast-cancer-fact-sheet-508.pdf
- https://www.cdc.gov/cancer/breast/men/
- https://www.cancer.org/content/dam/cancer-org/research/cancer-facts-and-statistics/breast-cancer-facts-and-figures/breast-cancer-facts-and-figures-2019-2020.pdf