Gray, D. H. (1966). Manpower planning: An approach to the problem. Institute of Personnel Management.
Παραπομπή Chicago StyleGray, Daniel H. Manpower Planning: An Approach to the Problem. London: Institute of Personnel Management, 1966.
Παραπομπή MLAGray, Daniel H. Manpower Planning: An Approach to the Problem. Institute of Personnel Management, 1966.
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