Embassy of the People's Republic of China, [Date of publication not identified]
Buku Teks SO
Wiener, Solomon
Regents, 1960
Buku Teks SO
Heater, Derek
Longman, 1990
Buku Teks SO
Hansen, Phillip
Polity Press, 1993
Buku Teks SO
edited by Patrick Baert, Sokratis M. Koniordos, Giovana Procacci, Carlo Rizza
Routledge Kegan Paul, 2010
Buku Teks SO