Lua APA (7ú heag.)

Welti, A. (1983). Erich Heckel. Art.

Lua i Stíl Chicago (17ú heag.)

Welti, Alfred. "Erich Heckel." Art 1983.

Lua MLA (8ú heag.)

Welti, Alfred. "Erich Heckel." Art, 1983.

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