Göttner, R. (1973). Was soll - was kann Prognostik? Urania.
Čikaški stil citiranja (17. izdanje)Göttner, Reinhard. Was Soll - Was Kann Prognostik? Leipzig: Urania, 1973.
MLA način citiranja (8. izdanje)Göttner, Reinhard. Was Soll - Was Kann Prognostik? Urania, 1973.
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