Não informado. (1970). Rail International. International Railway Congress Association.
Chicago-referens (17:e uppl.)Não informado. Rail International. Brussels: International Railway Congress Association, 1970.
MLA-referens (8:e uppl.)Não informado. Rail International. International Railway Congress Association, 1970.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.