Martin, D. (2005). Tough calls: AT&T and the hard lessons learned from the telecom wars. AMACOM.
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Chicago-čujuhus (17. p.)
Martin, Dick. Tough Calls: AT&T and the Hard Lessons Learned from the Telecom Wars. New York: AMACOM, 2005.
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MLA-čujuhus (9. p.)
Martin, Dick. Tough Calls: AT&T and the Hard Lessons Learned from the Telecom Wars. AMACOM, 2005.
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