Kotter, J. P. (2008). A Sense of Urgency. W. W Norton.
Lua i Stíl Chicago (17ú heag.)Kotter, John P. A Sense of Urgency. London: W. W Norton, 2008.
Lua MLA (9ú heag.)Kotter, John P. A Sense of Urgency. W. W Norton, 2008.
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