See Recent, Centre for economic research (Department of political economy of the University of Modena and Reggio Emilia), ‘The Rise of a District Lead Firm: The case of WAM (1968 – 2003)’, February 2009.
Vt hiljuti, Majandusuuringute Keskus (Modena ja Reggio Emilia Ülikooli poliitökonoomia osakond), „The Rise of a District Lead Firm: The case of WAM (1968 - 2003)”, veebruar 2009.