Canobbio, Mary M., author
Mosby, 1996
Buku Teks
Skelly, Carole J., author
Garland Publishing, 1994
Buku Referensi
Phillips, Roger, author
Pan Books , 1990
Buku Teks
Stengler, Mark, author
Prentice-Hall, 2001
Buku Teks
Katz, Donald La Verne, author
McGraw-Hill, 1959
Buku Referensi