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Lua i Stíl Chicago (17ú heag.)Verra, Gerben Jan. International Account Management: An Organizational Dilemma : An Explorative Study Within the Field of International Business to Business Marketing. Utrecht: Drukkerij Elinkwijk BV, 1994.
Lua MLA (8ú heag.)Verra, Gerben Jan. International Account Management: An Organizational Dilemma : An Explorative Study Within the Field of International Business to Business Marketing. Drukkerij Elinkwijk BV, 1994.
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