edited by Kate Myers; with Graham Clayton, David James and Jim O`Brien
RoutledgeFalmer, 2005
Buku Teks
Castle, Paul, author
SAGE, 2018
Buku Teks
Artikel Jurnal
McArthur, Thomas Burns, author
Cambridge University Press, 1983
Buku Teks SO
Long, Calvin T., author
Pearson - Addison Wesley, 2009
Buku Teks