Spratto, George R., author
Delmar Cengage learning, 2010
Buku Referensi
Delmar, Cengage Learning, 2010
Multimedia
Spratto, George R., author
Delmar Cengage Learning, 2012
Buku Referensi
Hodgson, Barbara B., author
W.B. Saunders, 1997
Buku Referensi
Sheridan, Eleanor, author
W.B. Saunders , 1982
Buku Teks