Peccei, Aurelio, author
Kodansha International, 2009
Buku Teks
Krutch, Joseph Wood, author
Random House, 1959
Buku Teks
Toffler, Alvin, author
Pantja Simpati, 1991
Buku Teks
Toffler, Alvin, author
Pantja Simpati, 1989
Buku Teks
Toynbee, Arnold J., author
Oxford University Press, 1961
Buku Teks