Luard, Evan
Oxford University Press , 1964
Buku Teks
Anderson, Malcolm
Clarendon Press, 1989
Buku Teks
Kim, Samuel S., 1935-, author
Westview Press, 1984
Buku Teks
Mander, Linden A.
Stanford University Press, 1948
Buku Teks
Levi, Werner
The University of Minnesota Press, 1953
Buku Teks