Clynes, A.J., author
International Development Program of Australian Universities, 1985
Buku Teks
Tilbury, Alex, author
Cambridge University Press , 2011
Buku Teks
Doff, Adrian, author
Cambridge University Press , 2010
Buku Teks
Macmillan, 1965
Buku Teks
Doff, Adrian, author
Cambridge University Press, 2010
Multimedia