NCI: Ewing Family of Tumors - Information about the diseases, treatment, and clinical trials. - http://www.cancer.gov/cancertopics/types/ewings/
ACS: Ewing Family of Tumors - Provides a detailed guide to these three similar tumors. Includes information about prevention, diagnosis, treatment, and research. - http://www.cancer.org/docroot/CRI/CRI_2_3x.asp?rnav=cridg&dt=48