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