Drucker, P. (2007). People and performance: The best of peter Drucker on management (1st.). H.B. School Press.
Lua i Stíl Chicago (17ú heag.)Drucker, Peter. People and Performance: The Best of Peter Drucker on Management. 1st. Boston: H.B. School Press, 2007.
Lua MLA (9ú heag.)Drucker, Peter. People and Performance: The Best of Peter Drucker on Management. 1st. H.B. School Press, 2007.
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