Luthans, Fred, author
McGraw-Hill , 1979
Buku Teks
Mosley, Donald C., author
South-Western Publishing, 1985
Buku Teks
Benton, Lewis R., author
McGraw-Hill, 1972
Buku Teks
American Management Association, 1957
Buku Teks
Tracy, Brian, author
American Management Association, 2013
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