Oxford University Press, 1995
Majalah, Jurnal, Buletin
Davies, Alan, 1931 February 17-
Lawrence Erlbaum, 2005
Buku Referensi
Davies, Alan, 1931 February 17-
Lawrence Erlbaum Associates, 2005
Buku Referensi
Corder, Stephen Pit, editor
Penguin Books , 1973
Buku Teks
edited by Keith and Helen Johnson
Blackwell, 1999
Buku Referensi