Göttner, R., & Fischer, P. (1973). Was soll - was kann Prognostik? (1. Auflage, (1.-10. Tsd.).). Urania.
Chicago Style (17. basım) AtıfGöttner, Reinhard, ve Peter Fischer. Was Soll - Was Kann Prognostik? 1. Auflage, (1.-10. Tsd.). Leipzig ; Jena ; Berlin: Urania, 1973.
MLA (8th ed.) AtıfGöttner, Reinhard, ve Peter Fischer. Was Soll - Was Kann Prognostik? 1. Auflage, (1.-10. Tsd.). Urania, 1973.
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