FREEMAN-BELL, G. (1993). Management In Engineering Principles And Practice Gail Freeman-bell, James Balkwill. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)FREEMAN-BELL, Gail. Management In Engineering Principles And Practice Gail Freeman-bell, James Balkwill. Prentice-Hall, 1993.
Lua MLA (8ú heag.)FREEMAN-BELL, Gail. Management In Engineering Principles And Practice Gail Freeman-bell, James Balkwill. Prentice-Hall, 1993.
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