Sheldon, Sidney
Gramedia Pustaka Utama, 1999
Buku Teks
Wharton, Edith
Everyman, 1993
Buku Teks
Kirby, David K.
Gale Research, 1975
Buku Referensi
Sheldon, Sidney
Gramedia Pustaka Utama, 1991
Buku Teks
Conroy, Pat
Gramedia Pustaka Utama, 1996
Buku Teks