Although at first it is very difficult for him to stop sucking his thumb, Donald gradually substitutes other activities until he never even thinks about it any more.
- ISBN10 0399213732
- ISBN13 9780399213731
- Publish Date 6 April 1987
- Publish Status Out of Print
- Out of Print 28 June 2021
- Publish Country US
- Imprint Putnam Publishing Group
- Format Hardcover
- Pages 32
- Language English