Widdowson, Peter, author
Routledge, 1999
Buku Teks
Westland, Peter
English University, 1950.
Buku Teks
edited by Louis G. Locke, William M. Gibson, George Arms
Holt, Rinehart and Winston, 1959
Buku Teks
Yearimdang, author
PT Elex Media Komputindo, 2017
Buku Teks
Daiches, David
New York, Cornell University Press
Buku Referensi