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Larson, Erik W. and Gray, Clifford F. (2018) PROJECT MANAGEMENT THE MANAGERIAL PROCESS 7E. McGraw-Hill Education, New York. ISBN 978-1-259-66609-4
Larson, Erik W. and Gray, Clifford F. (2011) Project Management the Managerial Process, 5 ed. Mc Graw Hill, New York. ISBN 978-0-07-340334-2