Griggs, Barbara, author
Pan Books, 1995
Buku Referensi
Melville, Arbaella, author
Willliam Collins & Sons, 1987
Buku Referensi
Eddleston, Michael
New York Oxford Univ. Press 2002,
Buku Referensi
Bredow, Miriam, author
Gregg Publishing, 1959
Buku Referensi
Zerwekh, JoAnn Graham, author
W.B. Saunders Company , 1999
Buku Teks