English as an international language in Asia: implications for language education
editors, Andy Kirkpatrick, Roland Sussex
Springer, 2012
Sambrook, G.A., author
The English language
Longman, 1947
 Buku Teks
Sambrook, G.A., author
English language
Longmans, Green, 1947
 Buku Teks
English this way English Language Services.
London Collier-Macmillan 1965,
 Buku Teks
The universal dictionary of the English language
edited by Henry Cecil
George Routledge & Sons, 1946
 Buku Referensi