NCI: Anal Cancer 
Resource from the U.S. National Cancer Institute including causes, genetics, prevention, statistics, treatment and clinical trials.
http://www.cancer.gov/cancer_information/cancer_type/analNCCN: Anal Carcinoma
Provides the professionally established guidelines for this disease.
http://www.nccn.org/professionals/physician_gls/PDF/anal.pdf
MedlinePlus: Anal Cancer
Provides description of disease, treatment options, diagnosis, research, illustrations, and links.
http://www.nlm.nih.gov/medlineplus/analcancer.html
ACS: All About Anal Cancer
Detailed guide and overall view of the disease.
http://www.cancer.org/docroot/CRI/CRI_2x.asp?sitearea=&dt=47
Cancerbackup: Anal Cancer
Information about this type of cancer includes symptoms, diagnosis, and treatment.
http://www.cancerbackup.org.uk/Cancertype/Anal/Analcancer
