1. Browse NL. The neck. In: Browse NL, (editor). An introduction to the symptoms and signs of surgical disease. Taylor & Francis Group. 3rd ed. Florida (Fl), USA: CRC Press; 2002. p. 255.
2. Watkinson JC, Gaze MN, Wilson JA. Metastatic neck disease. In: Watkinson JC, Gaze MN, Wilson JA, editors. Stell & Maran’s head & neck surgery. 4th ed. Oxford/Auckland/Boston/Johannesburg/Melbourne/New Delhi: Butterworth Heinemann; 2000. p. 201–32.
3. Schwartz SI, Shires GT, Spencer FC, Daly JM, Fischer JE, Galloway AC. Thyroid and parathyroid. In: Schwartz SI, Shires GT, Spencer FC, Daly JM, Fischer JE, Galloway AC, editors. Principles of surgery. 7th ed. New York (NY), USA: McGraw-Hill;1999. p. 1661.
4. Blair RL. Head & neck surgery. In: Cuschieri A, Steele RC, Moosa AR, (editors). Essential surgical practice. 4th ed. London, UK: Hodder Arnold; 2002. p. 1045.
5. Jain A, Pathak S. Rare developmental abnormalities of thyroid gland, especially multiple ectopia: a review and our experience. Indian J Nucl Med. 2010;25(4):143–7.