Silberman, Melvin L., author
Pfeffer, 2006
Buku Teks
Keenan, Denis, author
Pitman, 1992
Buku Teks
Slapper, Gary, author
Cavendish Publishing Limited, 2000
Buku Teks
Hicks, Wynford, author
Routledge, 1995
Buku Teks
Fischbach, Frances Talaska, author
J.B. Lippincott, 1996
Buku Teks