Não informado. (2020). American Engineer and Railroad Journal. M.N. Forney.
Chicago-referens (17:e uppl.)Não informado. American Engineer and Railroad Journal. New York: M.N. Forney, 2020.
MLA-referens (8:e uppl.)Não informado. American Engineer and Railroad Journal. M.N. Forney, 2020.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.