edited by Samuel Rapport and Helen Wright
New American Library, 1962
Buku Teks
Energlyn, Lord
McGraw-Hill, 1973
Buku Teks
Busson, Bernard
Putnam, 1956
Buku Teks
edited by J.F. White
Prentice-Hall, 1962
Buku Teks
Bames, Charles W., author
John Wiley & Sons, 1980
Buku Teks