Breit, Harvey
The World Pub. Comp., 1956
Buku Teks
edited by Barry Turner
Macmillan and The Free Press, 1992
Buku Referensi
edited by Barry Turner
Macmillan, 1992
Buku Referensi
Colin-Jones, Graham, author
Times Books International, 1989
Buku Teks
Colin-Jones, Graham, author
Times Books International, 1995
Buku Teks