Lapworth, Phil, author
Sage Publications, 2004
Buku Teks
editors, Allen E. Bergin, Sol L. Garfield
John Wiley & Sons, 1994
Buku Referensi
edited by Allen E. Bergin, Sol L. Garfield
John Wiley & Sons, 1994
Buku Referensi
Sage, 2001
Buku Teks
edited by Ray Woolfe, Windy Dryden, Sheelagh Strawbridge
Sage Publications, 2003
Buku Referensi