Smidt, Sandra, author
Routledge, 2007
Buku Teks
edited by Janet Moyles
McGraw-Hill, 2007
Buku Teks
Curtis, Audrey, author
Routledge, 2009
Buku Teks
Baldock, Peter, author
McGraw-Hill, 2011
Buku Teks
Baldock, Peter, author
McGraw-Hill; Open University Press, 2011
Buku Teks