Inkeles, Alex
Harvard University Press, 1974
Buku Teks
Huyghe, Rene, author
Weatherhill, 2007
Buku Teks
Krutch, Joseph Wood, author
Greenwood Press, 1979
Buku Teks
edited by, Alvin Toffler
Random House, 1972
Buku Teks
Toynbee, Arnold J., author
Kodansha International, 1976
Buku Teks