Tolan, Janet, author
Sage, 2003
Buku Teks
Mearns, Dave, author
Sage Publications, 2003
Buku Teks
Casemore, Roger
Sage Publications, 2006
Buku Teks
Joyce, Phil, author
Sage Publications , 2004
Buku Teks
Lister-Ford, Christine, author
Sage Publications, 2002
Buku Teks