Jordan, Thomas E.
Springer, 2012
eBooks
Draper, Peter, author
Routledge , 1997
Buku Teks
Sweden : Forsakringskassan ( Swedish Social Insurance Agency ), 2006,
Majalah, Jurnal, Buletin
Tanya R. Fitzpatrick, editor
Springer, 2018
Buku Teks
edited by Graziella Caselli and Alan D. Lopez
Oxford University Press, 1996
Buku Teks