Estolas, Josefina V., author
Miranda, 1973
Buku Teks
Riley, Matilda White
Harcourt, Brace and world, 1963
Buku Teks
Malhotra, Naresh K.
Prentice Hall International, 1996
Buku Teks
Silvia Ulfa, author
PAU-EK-UI, 1991
Buku Teks
Aaker, David A., author
John Wiley & Sons, 1995
Buku Teks