Sky, T. (2011). The National Road and the difficult path to sustainable national investment. University of Delaware Press.
Chicago-referens (17:e uppl.)Sky, Theodore. The National Road and the Difficult Path to Sustainable National Investment. Newark: University of Delaware Press, 2011.
MLA-referens (9:e uppl.)Sky, Theodore. The National Road and the Difficult Path to Sustainable National Investment. University of Delaware Press, 2011.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.