Bradford, Richard, 1957-, author
Routledge, 2001
Buku Teks
P. F. Collier & Son Corporation, 1959
Buku Teks
Baines, Paul, 1961-, author
Routledge, 2000
Buku Teks
Pattie, David, author
Routledge , 2000
Buku Teks
Rudd, Gillian, author
Routledge , 2001
Buku Teks