FREEMAN-BELL, G. (1993). Management In Engineering Principles And Practice Gail Freeman-bell, James Balkwill. Prentice-Hall.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रFREEMAN-BELL, Gail. Management In Engineering Principles And Practice Gail Freeman-bell, James Balkwill. Prentice-Hall, 1993.
एमएलए (8वां संस्करण) प्रशस्ति पत्रFREEMAN-BELL, Gail. Management In Engineering Principles And Practice Gail Freeman-bell, James Balkwill. Prentice-Hall, 1993.
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