Source: http://www.univ-bejaia.dz/jspui/bitstream/123456789/11262/1/Le%20r%C3%B4le%20et%20l%E2%80%99importance%20du%20transport%20routier%20de%20marchandise%20dans%20le%20d%C3%A9veloppement%20de%20la%20chaine%20logistique.pdf