Barry, Patricia D.
Lippincott , 1998
Buku Teks
Worley, Nancy K.
Mosby , 1997
Buku Teks
Reynolds, Amanda
Open universtity press , 2000
Buku Teks
Sage Publications, 1987
Buku Teks
[edited by] Katherine M. Fortinash, Patricia A. Holoday Worret
St Louis , 2004
Buku Teks