Volkema, R. J. (2006). Leverage: How to get it and how to keep it in any negotiation. AMACOM.
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Chicago-čujuhus (17. p.)
Volkema, Roger J. Leverage: How to Get It and How to Keep It in Any Negotiation. New York: AMACOM, 2006.
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MLA-čujuhus (9. p.)
Volkema, Roger J. Leverage: How to Get It and How to Keep It in Any Negotiation. AMACOM, 2006.
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