* De Amerikaanse Kankervereniging: [https://www.cancer.org/cancer/rectal-cancer.html](https://www.cancer.org/cancer/rectal-cancer.html)

* Het Nationaal Kankerinstituut: [https://www.cancer.gov/types/colorectal/](https://www.cancer.gov/types/colorectal/)

* De Mayo Clinic: [https://www.mayoclinic.org/diseases-conditions/rectal-cancer/symptoms-causes/syc-20352256](https://www.mayoclinic.org/diseases-conditions/rectal-cancer/symptoms-causes/ syc-20352256)

* WebMD: [https://www.webmd.com/colorectal-cancer/rectal-cancer](https://www.webmd.com/colorectal-cancer/rectal-cancer)

* Gezondheidslijn: [https://www.healthline.com/health/rectal-cancer](https://www.healthline.com/health/rectal-cancer)