Cutts, Martin, author
Oxford University Press, 1995
Buku Teks
revised by John Pitson
Australian Goverment Publishing, 1978
Buku Referensi
Finkelstein, Leo, author
McGraw-Hill, 2005
Buku Teks
Finkelstein, Leo, author
McGraw-Hill , 2000
Buku Teks
Simpson, Paul, author
Routledge , 2004
Buku Teks