FREEMAN, B. G. (1993). Management In Engineering Principles And Practice Gail Freeman Bell, James Blackwill. s.n.
Chicago-referens (17:e uppl.)FREEMAN, Bell Gail. Management In Engineering Principles And Practice Gail Freeman Bell, James Blackwill. s.n, 1993.
MLA-referens (8:e uppl.)FREEMAN, Bell Gail. Management In Engineering Principles And Practice Gail Freeman Bell, James Blackwill. s.n, 1993.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.