Deutsch, Karl Wolfgang, 1912-1992
Houghton Mifflin, 1970
Buku Teks
Linebarger, Paul Myron Anthony, 1913-1966
York D van Nostrand, 1954
Buku Teks
edited by Stephen K. Bailey
United States Information Agency, 1973
Buku Teks
Quigley, Harold S.
University of Minnesota Press, 1956
Buku Teks
Stoker, Gerry
Macmillan, 1991
Buku Teks