Halter, Margaret Jordan, author
W.B. Saunders, 2014
Buku Teks
Paquette, Mary, author
Jones and bartlett , 1991
Buku Teks
Rinomhota, A. Shupikai, author
Churchill Living Stone, 2000
Buku Teks
Clinton, Michael
Sydney Prentice Hall 1996 ,
Buku Teks
edited by Joan W. Reighley
Williams & Wilkins , 1988
Buku Teks