Text Books
Pediatric Radiation Oncology. Halperin, Constine, Tarbell and Kun, published by Lippincott, Williams and Wilkins, 4th Edition.
Principles and Practice of Pediatric Oncology. Pizzo and Poplack, published by Lippincott, Williams and Wilkins, 5th Edition.
Other sources
COG educational material
Canadian Cancer Statistics 2009
Recommended Links:
C17 - Children's Cancer and Blood Disorder Council
BC Children's Hospital Oncology, Hematology and BMT

Above is a lithograph by Edvard Munch of a sick child