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