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Ullmann, John E., Christman, Donald A.. (1986). Handbook of engineering management . New York: John Wiley & Sons.

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Ullmann, John E., Christman, Donald A.. Handbook of engineering management. New York: John Wiley & Sons, 1986. Text.

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Ullmann, John E., Christman, Donald A.. Handbook of engineering management. New York: John Wiley & Sons, 1986. Text.

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Ullmann, John E., Christman, Donald A.. Handbook of engineering management. New York: John Wiley & Sons, 1986. Print.