Meier, Richard L.
The Massachusett Institute of Technology, 1974
Buku Teks SO
Dowton, Paul F.
Springer , 2009
Buku Teks SO
by Catherine Bauer ... [et al.] ; edited by Coleman Woddbury
University of Chicago Press, 1953
Buku Teks SO
by Catherine Bauer [and others]; edited by Coleman Woodbury
The University of Chicago Press, 1953
Buku Teks SO
Amin, Ash
Polity Press, 2010
Buku Teks SO