Cita APA (7th ed.)

Hentzen, A. (1956). Paul Klee. Kunstverein in Hamburg.

Cita Chicago (17th ed.)

Hentzen, Alfred. Paul Klee. Hamburg: Kunstverein in Hamburg, 1956.

Cita MLA (8th ed.)

Hentzen, Alfred. Paul Klee. Kunstverein in Hamburg, 1956.