Day, R.A., author
Erlangga , 1992
Buku Teks
Day, R.A., author
Erlangga, 1981
Buku Teks
Day, R.A., author
Airlangga University Press, 1994
Buku Teks
Day, R.A., author
Erlangga, 1980
Buku Teks
Rossi, Renzo
Macmillan Library Reference, 1996
Buku Referensi