McGowan, Maryrose, author
John Wiley & Sons, [Date of publication not identified]
Buku Teks
McGowan, Maryrose, author
John Wiley & Sons, 1996
Buku Teks
Delmon, Jeffrey, author
Sweet & Maxwell, 2000
Buku Teks
edited by A.D. Austen, R.H. Neale
International Labour Office, 1995
Buku Referensi
Bonda, Penny, author
Wiley, 2007
Buku Teks