Kohout, Frank J., author
John Wiley & Sons, 1974
Buku Teks
Blalock, Hubert M., author
McGraw-Hill, 1960
Buku Teks
Blalock, Hubert M., author
McGraw-Hill , 1981
Buku Teks
Blalock, Hubert M., author
McGraw-Hill, 1972
Buku Teks
Bingham, Tony, author
American Society for Training & Development, 2011
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