Miller, Jamie
Oxford University Press, 2016
eBooks
Bowles, Chester
University Of California Press, 1956
Buku Teks SO
Spooner, F.P.
Fredereck A.Praeger Publisher, 1960
Buku Teks SO
edited by Patrick Giddy
The Council For Research In Values And Philosophy, 2001
Buku Teks SO
United Nations. Department of Public Information
United Nations. Department of Public Information, 1994
Buku Referensi