Schorske, Carl E.
German social democracy
Harvard University Press, 1955
 Buku Teks
Morton, Desmond
Social democracy in Canada
Samuel Stevens, 1977
 Buku Teks
Sperling, Sebastian
The German social market: a concept of the past?
2006
 Artikel Jurnal
German democracy at work : a selective study / edited by James K. Pollock... [et.al.]
The University Michigan Press, 1995
 Buku Teks
Epstein, Irwin
Social workers at work
F.E.Peacock Publishers, Inc., 1977
 Buku Teks