Parrot, Martin, author
Cambridge University Press, 2003
Buku Teks
McArthur, Tom (Thomas Burns), author
Cambridge University Press, 1983
Buku Teks
Nunan, David, author
Pearson Education, 2000
Buku Referensi
Celce-Murcia, Marianne, author
Cambridge University Press, 2011
Buku Teks
Thornburn, Scott, 1950-, author
Cambridge University Press, 2017
Buku Teks