1. The origin of medical terms. 2nd ed. Baltimore: Williams & Wilkins, 1961: 143.
2. Stedman's Medical Dictionary. 17th ed. Baltimore: Williams & Wilkins, 1949: 340.
3. Stedman's Medical Dictionary. 21st ed. Baltimore: Williams & Wilkins, 1966: 456.
4. Stedman's Medical Dictionary. 22nd ed. Baltimore: Williams & Wilkins, 1972: 358.
5. Dorland's Medical Dictionary. 19th ed. Philadelphia: WB Saunders, 1943: 441.