Redman, Stuart
Cambridge University Press, 1995
Buku Teks
Ellis, Robert
Harcourt Brace Javanovich, 1978
Buku Teks
Boddy, Michael
Sydney, Currency Press, 1974
Buku Teks
London Collier-Macmillan 1965,
Buku Teks
Suenobu, Mineo, author
Kobe University of Commerce, 1999
Buku Teks