William T. Hogan. (1972). The 1970s: Critical years for steel. Toronto: Lexington.
Chicago Style aipamenaWilliam T. Hogan. The 1970s: Critical Years for Steel. Toronto: Lexington, 1972.
MLA aipamenaWilliam T. Hogan. The 1970s: Critical Years for Steel. Toronto: Lexington, 1972.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.