Sparrow, John
Sage, 1998
Buku Teks
Halpern, Diane F., author
Lawrence Erlbaum Associates, Publishers, 1996
Buku Teks
Mingers, John, author
Springer, 2006
Buku Teks
Sparrow, John, 1906-
Published for the British Council and the National Book League by Longmans, Green & Co, 1992
Buku Teks
Tommy Koh, author
Asia-Europa Foundation, 2001
Buku Teks