Calkins, T. (2012). Breakthrough Marketing Plans (2nd.). Palgrave Macmillan.
Lua i Stíl Chicago (17ú heag.)Calkins, Tim. Breakthrough Marketing Plans. 2nd. New York: Palgrave Macmillan, 2012.
Lua MLA (9ú heag.)Calkins, Tim. Breakthrough Marketing Plans. 2nd. Palgrave Macmillan, 2012.
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