Tohutoro APA (7th ed.)
Friedrich, W. (1983). Zwillinge. Dt.Verl.d.Wiss.
Tohutoru Kātū Chicago (17th ed.)
Friedrich, Walter. Zwillinge. Berlin: Dt.Verl.d.Wiss, 1983.
Tohutoro MLA (9th ed.)
Friedrich, Walter. Zwillinge. Dt.Verl.d.Wiss, 1983.
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