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Wiest J. D, Levy F K, . (1977). Management guide to PERT/CPM. New Delhi: P H I.
Wiest J. D, Levy F K, . 1977. Management guide to PERT/CPM. New Delhi: P H I.
Wiest J. D, Levy F K, . Management guide to PERT/CPM. New Delhi: P H I. 1977.