Hardy, Charles O., author
Brookings Institution, 1940
Buku Teks
Hammond, R. J. (Richard James), 1911-, author
Stanford University Press, 1954
Buku Teks
Scott, Harriet Fast, author
National Strategy Information Center, 1983
Buku Teks
edited by Leonard D. White
University of Chicago Press, 1945
Buku Teks
Shillony, Ben-Ami
Clarendon Press, 1991
Buku Teks