Source: Michael H. Belzer, “The Jobs Tunnel: The Economic Impact of Adequate Border-Crossing Infrastructure,” Report Commissioned by the Detroit River Tunnel Partnership, (November 2003): 49-50, 53.
Source : Michael H. Belzer, « The Jobs Tunnel : The Economic Impact of Adequate Border-Crossing Infrastructure », Rapport commandé par le Detroit River Tunnel Partnership (novembre 2003) : 49,50 et 53.