Halvorson, H. G. (2012). Nine things successful people do differently (1.). Harvard business review press.
Styl ChicagoHalvorson, Heidi Grant. Nine Things Successful People Do Differently. 1. Boston: Harvard business review press, 2012.
Citace podle MLAHalvorson, Heidi Grant. Nine Things Successful People Do Differently. 1. Harvard business review press, 2012.
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