Rodgers, Gerry
International Labor Office , 1984
Buku Teks
Glicken, Morley D.
Elsevier , 2009
Buku Teks
Deborah R. McFarlane, editor
Jones & Bartlett Learning, 2015
Buku Teks
El-Sayed, Abdulrahman M.
Oxford University Press, 2017
eBooks
White, Kathleen M.
Springer Publishing Company, LLC, 2016
Buku Teks