Tohutoro APA (7th ed.)
Gregor, W. (1932). Wechselformen in der Therapie.
Tohutoru Kātū Chicago (17th ed.)
Gregor, Willi. Wechselformen in Der Therapie. o. O, 1932.
Tohutoro MLA (9th ed.)
Gregor, Willi. Wechselformen in Der Therapie. 1932.
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