Daniels, Diane
Erlangga, 1995
Buku Teks
Waworuntu, Tony, author
Gramedia Pustaka Utama, 1991
Buku Teks
Waworuntu, Tony, author
Gramedia Pustaka Utama, 1995
Buku Teks
Rowley, Jennifer
Kogan Page, 1991
Buku Teks
Woolcott, Lysbeth A., author
Erlangga, 1990
Buku Teks