Founding year

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I edited the year to 1918, according to this: http://www.sistory.si/publikacije/prenos/?urn=SISTORY:ID:7016 and also this "Mariborska društva in mariborsko življenje pred drugo svetovno vojno, PAM; 2005" There are still many other sources with 1919 http://www.fussballabzeichen.at/index.php?link=galerie&cat1=06) JUGOSLAWIEN&cat2=SLOWENIEN&cat3=MARIBOR - Sport Verein RAPID &show

Any ideas?