International Labour Office, 1998
Buku Teks
Ho, Christine G.T, author
Kumarian Press, 2012
Buku Teks
penyunting, Peter Davies; penerjemah, A. Rahman Zainuddin
Yayasan Obor Indonesia , 1994
Buku Teks
Barak, Aharon, author
Cambridge University Press, 2015
eBooks
edited by James C. Hsiung
Paragon House, 1985
Buku Teks