Childs, David
Routledge , 1997
Buku Teks
Pollard, Sidney
Routledge, 1997
Buku Teks
Macmillan Education, 1991
Buku Teks
Stepanchev, Stephen, author
Harper and Row, 1965
Buku Teks
chosen by MacDonald P. Jackson and Vincent O'Sullivan
Oxford University Press, 1983
Buku Teks