Hibbs, J. (1975). The bus and coach industry: Its economics and organization. Dent.
Chicago-referens (17:e uppl.)Hibbs, John. The Bus and Coach Industry: Its Economics and Organization. London: Dent, 1975.
MLA-referens (8:e uppl.)Hibbs, John. The Bus and Coach Industry: Its Economics and Organization. Dent, 1975.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.