Nation, I.S.P., author
Heinle Cengage Learning, 2011
Buku Teks
Bauer, Lauria
London : Routledge, 1998
Buku Teks
Morgan, John, 1944-2004, author
Oxford University Press, 1990
Buku Teks
Mason, Jennifer, author
Sage, 2009
Buku Teks
Jonathan Bradshaw and Roy Sainsbury, editors
Routledge, Taylor & Francis Group, 2019
Buku Teks