1. Fletcher CD, Bridge JA, Hogendoorn PC, Mertens F. WHO Classification of Tumours of Soft Tissue and Bone. 4th ed. Lyon, France: IARC Press; 2013.
2. Francis MD, Charman J, Lawrence G, Grimer R. Bone and Soft Tissue Sarcomas UK Incidence and Survival: 1996 to 2010 Version 2.0. NCIN; 2013.