1. Adult Cancer Pain (version 1.2014). NCCN clinical practice guidelines in oncology. National Comprehensive Cancer Network. Retrieved from http://www.nccn.org .
2. Parris W, Eriator I. Chapter 14 cancer pain management. In: Smith HS, editor. Current therapy in pain. Elsevier Health Sciences/Saunders; 2008. p. 97–106. eBook ISBN: 9781437710090; eBook ISBN: 9781455757640.
3. Sharma V, Casasola O. Chapter 23 cancer pain. In: Benzon H, Rathmell JP, Wu CL, Turk DC, Argoff CE, Hurley RW, editors. Practical management of pain. 5th ed. Elsevier Health Sciences/Mosby; 2013. p. 335–45. Language: English, ISBN-10: 0323083404, ISBN-13: 978-0323083409.
4. Waldman SD. Chapter 208 cancer pain. Pain review (346–349). Elsevier Health Sciences; 2009.