Jane Picford, editor
Cavendish Publishing , 2000
Buku Teks
Orford, Jim
John Wiley & Sons, 1992
Buku Teks
Smalley, Ruth Elizabeth
Columbia University Press, 1971
Buku Teks
Chichester, Myra
W.B. Saunders, 1995
Buku Teks
Anderson, Elizabeth T.
Lippincott , 2000
Buku Teks