Christopher, author
Dinastindo, 1992
Buku Teks
Young, Margaret Levine, author
IDG Books Wordwide, 1993
Buku Teks
Asia Pacific Economic Cooperation, 2000
Buku Teks
Birkett, Julian, author
A & C Black, 1993
Buku Teks
Fardon, John, author
Platinum, 2007
Buku Referensi