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Buku Teks
Newby, Julian, 1957-, author
Routledge, 1997
Buku Teks
Pantry, Sheila, author
Facet Publishing, 2003
Buku Teks
Jones, Hugh
Routledge, 1996
Buku Teks
Bowley, Arthur
Institute of Personnel Management , 1972
Buku Teks