- Sucking of thumbs
- found: Work cat.: Cooney, N.E. Donald says thumbs down, c1987.
- found: Web. 3.
- found: Hennepin (Thumb-sucking see Finger-sucking)
- found: Spock, B. Baby and child care, 1976: pp. 249-258 (thumb sucking)
- 1986-07-23: new
- 1998-08-17: revised
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