Jessup, Philip Caryl, 1897-1986
Yale University Press, 1956
Buku Teks SO
Hannerz, Ulf
Routledge, 1996
Buku Teks
Becker, Christian U.
Springer, 2012
eBooks
Okawa, Ryuho
IRH Press, 1991
Buku Teks SO
Collier, John Greenwood
Cambridge University Press, 1987
Buku Teks