Fukuyama, Francis
Farrar, Straus and Giruox, 2012
Buku Teks SO
McDonald, Lee Cameron
Harcourt, Brace & World, 1968
Buku Teks SO
Pak, Pyong-son
Jimoondang, 2003
Buku Teks
edited by Colin Mackerras
University of Hawaii Press, 1988
Buku Teks SO
Lefebvre, Georges
Routledge, 2001
Buku Teks SO