edited by A.D. Austen, R.H. Neale
International Labour Office, 1995
Buku Referensi
International, 1995
Buku Teks
Woodson, R. Dodge, author
Elsevier, 2012
Buku Teks
Trauner, Theodore J., author
John Wiley & Sons. Inc., 1993
Buku Teks
McCarthy, Richard C., author
[American Library association;American Library association, American Library association], 2007
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