Wild, John J.
Pearson, 2016
Buku Teks
editor, Oliva Blanchette, Tomonobu Imamich, George F. McLean, Togi M. P. Pangaribuan
The Council for Research in Values and Philosophy , 2001
Buku Teks SO
Artikel Jurnal
edited by Christian Reus-Smit and Christian Reus-Smit
United Kingdom Oxford University Press, 2017
Buku Teks
Blackwell, 2007
Buku Teks