E. Saefullah Wiradipradja
Regional Institute of Higher Education and Development, 1976
Buku Teks SO
Packer, Herbert L.
McGraw-Hill, 1973
Buku Teks SO
Church, W. Lawrence
ELIPS II, 2002
Buku Teks SO
International Legal Center, 1975
Buku Teks SO
edited by Edward Rubin
Cambridge University Press, 2012
Buku Teks SO