Sully, Philippa, author
Elsevier, 2005
Buku Teks
Sully, Philippa
Mosby Elsevier, 2010
Buku Teks
Norton, Barbara A.
Appleton-Century-Crofts , 1986
Buku Teks SO
edited by David Partington
Sage, 2002
Buku Teks SO
Rutherfoord, Andrea J., author
Prentice-Hall, 2001
Buku Teks