Hersey, P. & Blanchard, K. H. Life cycle theory of leadership. Training and Development Journal. 1969, 23 (5): 26–34 [2023-01-22]. (原始内容存档于2015-09-01).
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Hersey, P. & Blanchard, K. H. Life cycle theory of leadership. Training and Development Journal. 1969, 23 (5): 26–34 [2023-01-22]. (原始内容存档于2015-09-01).