Halvorson, H. G., & Heidi Grant Halvorson. Chín 9 things successful people do differently. Boston, Mass: Harvard Business Review Press.
Chicago-tyylinen lähdeviittausHalvorson, Heidi Grant, ja Heidi Grant Halvorson. Chín 9 Things Successful People Do Differently. Boston, Mass: Harvard Business Review Press.
MLA-viiteHalvorson, Heidi Grant, ja Heidi Grant Halvorson. Chín 9 Things Successful People Do Differently. Boston, Mass: Harvard Business Review Press.
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