RIES, A. (1991). Harse sense: The key to success is.. McGraw-Hill.
Chicago-čujuhus (17. p.)RIES, Al. Harse Sense: The Key to Success Is.. New York: McGraw-Hill, 1991.
MLA-čujuhus (9. p.)RIES, Al. Harse Sense: The Key to Success Is.. McGraw-Hill, 1991.
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