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The study by Gdańsk researchers supports the theory of eastern (present Ukraine) origins of the Slavs (and not the other way around), so I used a direct quotation that ends (summarizes) their abstract. That ancient Roman scholars "new nothing" about the tribes of ancient Poland is not very revealing. Jordanes already knew quite a bit and modern archeologists know still more. A. Kupicki puts verification tags on statements that are already referenced by work done by reputable scholars. The verifiability concept in Wikipedia applies to attributing statements to "a reliable, published source", to avoid "original research". Orczar (talk) 14:01, 29 October 2011 (UTC)[reply]
I do not wish to engage in edit wars even if justifiable, because I have no idea what your background is, nevertheless in your edit you directly contradicted the source which I tracked down and hotlinked. The article published by Gdańsk University says exactly the opposite of what you claim. That's why, your further claims of referenced info (impossible to confirm) caught my attention as REDFLAG. I should have put a {dubious} tag in there. I don't trust what you say is written in that book, per above. — A. Kupicki (talk) 16:11, 29 October 2011 (UTC)[reply]
It would not be possible to write optimally informed Wikipedia articles on Polish subjects without access to Polish language sources and without access to non-internet sources, such as non-Google books or older periodicals. The same applies to articles in primary areas of interest of other languages. The "non-accessible foreign language source" you're apparently talking about is the first volume of the 10-volume Great History of Poland, a very major source. Orczar (talk) 21:11, 29 October 2011 (UTC)[reply]