Hughes, Colin Anfield, author
Oxford University Press, 1976
Buku Teks
15 - Vokasi
Center for Asian and Pacific Studies, Seikei University, 2022
Artikel Jurnal
Foreign Languages Publishing House, 1967
Buku Teks
Dooson Dong a, 2003
Buku Referensi
Chamil Wariya, author
MPH Group Publishing Sdn Bhd, 2009
Buku Teks