Klee, P. (1967). Paul Klee: 1879 - 1940 ; a retrospective exhibition, The Solomon R. Guggenheim Museum, New York (2. and rev. ed.).

Klee, Paul. Paul Klee: 1879 - 1940 ; a Retrospective Exhibition, The Solomon R. Guggenheim Museum, New York. 2. and rev. ed. New York, NY, 1967.

Klee, Paul. Paul Klee: 1879 - 1940 ; a Retrospective Exhibition, The Solomon R. Guggenheim Museum, New York. 2. and rev. ed. 1967.