Thaler, l. k. &. K. (2015). Grit to great. Crown Business.
Lua i Stíl Chicago (17ú heag.)Thaler, linda kaplan & Koval. Grit to Great. New York: Crown Business, 2015.
Lua MLA (9ú heag.)Thaler, linda kaplan & Koval. Grit to Great. Crown Business, 2015.
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