Bennet-Alexander, Dawn, author
Irwin/McGraw-Hill, 2004
Buku Teks
Daniels, Kathy, author
Chartered Institute of Personnel and Development, 2012
Buku Teks
Moran, John Jude, author
Prentice-Hall, 2002
Buku Teks
Macken, James J., author
The Law Book, 1990
Buku Teks
Pitt, Gwyneth, author
Sweet & Maxwell, 2011
Buku Teks