Daniels, Kathy
Chartered Institute of Personnel and Development, 2012
Buku Teks
Moran, John Jude
Prentice-Hall, 2002
Buku Teks
Macken, James J.
The Law Book, 1990
Buku Teks
Pitt, Gwyneth
Sweet & Maxwell, 2011
Buku Teks
Carr, Chris J.
Pitman, 1994
Buku Teks