COVEY STEPHEN. (2020). SEVEN HABITS OF HIGHLY EFFECTIVE PEOPLE. SIMON AND SCHUSTER PAPERBACKS.
Lua i Stíl Chicago (17ú heag.)COVEY STEPHEN. SEVEN HABITS OF HIGHLY EFFECTIVE PEOPLE. SIMON AND SCHUSTER PAPERBACKS, 2020.
Lua MLA (9ú heag.)COVEY STEPHEN. SEVEN HABITS OF HIGHLY EFFECTIVE PEOPLE. SIMON AND SCHUSTER PAPERBACKS, 2020.
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