Mcdermott, Richard T.
Lexing Publishing, 2000
Buku Teks
Friedmann, Wolfgang, 1907-1972
Little, Brown, 1959
Buku Teks
Kapp, Marshall B.
Jones & Bartllett, 2010
Buku Teks
edited by James F. Scotton and William A. Hachten
Wiley-Blackwell, 2010
eBooks
Chatterjee, S.K.
Martinus Nijhoff Publishers, 1981
Buku Teks