Dwyer, Judith, author
Prentice-Hall, 1993
Buku Referensi
Quible, Zone K.
Prentice Hall International,inc, 1996
Buku Teks
Quible, Zone K.
Prentice-Hall International, 1996
Koleksi Publik
Ewald, Helen Rothschild
Prentice-Hall International, 1997
Buku Teks
Holt, Rinehart and Winston of Canada, Limited, 1988
Buku Teks