Não informado. (1925). Institution of Production Engineers Journal. Institution of Production Engineers.
Chicago-referens (17:e uppl.)Não informado. Institution of Production Engineers Journal. London: Institution of Production Engineers, 1925.
MLA-referens (8:e uppl.)Não informado. Institution of Production Engineers Journal. Institution of Production Engineers, 1925.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.