Bibliography
- Appel, Karel: Psychopathological Notebook. Drawings and Gouaches 1948–1950. Bern - Berlin: Verlag Gachnang & Springer, 1999. ISBN 978-3-906127-57-6
- Tapié, Michel; Amsterdam (Netherlands). Stedelijk Museum. Karel Appel (Publisher: Amsterdam, author, 1955) OCLC 11554905 (Worldcat link: )
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