Kemm, John, author
Macmillan, 1995
Buku Teks
Edelman, Carole Lium, author
Mosby , 2010
Buku Teks
Penalver, Rafael A., author
Arco Publishing, Inc., 1981
Buku Teks
Penalver, Rafael A., author
Arco Publishing, 1984
Buku Teks
edited by John M. Last
Appleton Century , 1980
Buku Teks