Worley, Nancy K., author
Mosby , 1997
Buku Teks
Reynolds, Amanda, author
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
Videbeck, Sheila L., author
Walters kluwer , 2008
Buku Teks