3) Michel De Coster, Les enjeux des conflits linguistiques, L'Harmattan, Paris, 2007 ISBN 978-2-296-0339-8

At hte pages 122-1123, this author, Professor at the University of Liège is writing about the difficulties of the Walloon identy:  The historians ant the economists say that Belgium was the sthe second industrial power of the worl, in proportion to its population and its territory (...) But this place is the one of Wallonia where were concentrated the coal-mines, the blast furnaces, the iron and zinc factorioes, the wool industry, the glass industry, the weapons industry...  

The german historian Herbert Lüthy have some doubt about the thory of Weber about the link between calvinism because Wallonia (the firts industrial country after UK) was not calvinist but catholic...