Smith, Betty
Perrenial, 1998
Buku Teks
Rosenberg, Betty
Libraries Unlimited, 1982
Buku Referensi
Wharton, Edith, author
Everyman, 1993
Buku Teks
Kirby, David K., author
Gale Research, 1975
Buku Referensi
Fahrenheit, Fradhyt, author
FOUmediapublisher, 2006
Buku Teks