if you want to compare business universities , you use the official ranking of business universities .
official?
Supposing research were published in Polish, would this not give Polish universities an edge?
Polish is not the international language of scientists. English became the language of scientists because majority of the best research was lead in English speaking countries. Who doesn't know this language doesn't publish in English journals, but also doesn't do science, because publication has no sense without relating it to the newest publications from the world (which are in English)
But of course that gives advantage to English speaking countries, because there even not so innovative publications are in English journals, while in other countries lower quality publications are in local language. I agree that these rankings overrate English language universities but on the other hand there is no way to do better ranking. It also encourage scientists around the world to publish in English, which is good because make publications available to the world scientits community.