Dewar, Donald L.
Quality Circle Institute , 1984
Buku Teks
Kemp, Jerrold E., author
Harper and Row, 1985
Buku Teks
Mager, Robert F.
Fearon Publ., 1975
Buku Teks
George M. Piskurich, editor in chief
McGraw-Hill, 1993
Buku Referensi
McArdle, Geri, author
[American Management Association;, ], 2010
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