Cambridge University Press, 2009
eBooks
Michael Nelson, Martha Craven Nussbaum, James V. Mirollo, Mera J. Flaumenhaft
Jossey-Bass, 2000
Buku Teks SO
Gardiner, Eileen
Cambridge University Press, 2015
Buku Teks SO
Berry, David M. [David Michael]
Polity Press, 2017
Buku Teks SO
edited by Judy Reynolds
Haworth Press, 1994
Buku Referensi