Clifford, W. G. (1995). The key to succes: The silence of leadership. Beacon books.
Čikaški stil citiranjaClifford, William G. The Key to Succes: The Silence of Leadership. New Delhi: Beacon books, 1995.
MLA način citiranjaClifford, William G. The Key to Succes: The Silence of Leadership. Beacon books, 1995.
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