McKenzie, R.T.
British political parties the distribution of power within the conservative and labour parties
William Heinemann, 1955
 Buku Teks SO
Sweezy, Paul M. (Paul Marlor), 1910-2004
Socialism
McGraw-Hill, 1949
 Buku Teks SO
Sweezy, Paul M. (Paul Marlor), 1910-2004
Socialism
McGraw-Hill, 1949
 Buku Teks SO
Luddin, Muchlis Rantoni
Eksploitasi pekerja anak di perkebunan teh Cisarua Bogor
2002
 UI - Disertasi Membership
The State of worker protections in the United States: Unregulated work in New York City
 Artikel Jurnal