Directories in print 1991 : supplement
Gale Research, 1991
 Buku Referensi
Directories in print 1991 : part 2
Gale Research, 1991
 Buku Referensi
Directories in print 1991 : part 1
Gale Research, 1991
 Buku Referensi
The leading hotels of the world : 2000 directory.
Leading Hotels of the World, 2000
 Buku Teks
Directory of research in academic year 1996-97
National University of Singapore, [date of publication not identified]
 Buku Referensi
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