World Express Mapping Sdn. Bhd, [date of publication not identified]
Buku Referensi
World Express Mapping Sdn. Bhd, [date of publication not identified]
Buku Referensi
Bristow, Steve, author
Tropical Press Sdn Bhd, 1994
Buku Referensi
Chandran Jeshurun, author
Arus Intelek Sdn Bhd, 2004
Buku Referensi
Lai, Chee Kien
Petronas, 2007
Buku Teks