«At a Glance», Deutsche Post DHL Group, accessed April, 2016: dpdhl.com/en/about_us/at_a_glance.html
186
«DHL Invests $108 Million in Its Americas Hub», DHL, May 29, 2015: dhl.com/en/press/releases/releases_2015/group/dhl_invests_108_million_in_its_americas_h ub.html
