Toffler, Alvin, author
Bantam Books, 1990
Buku Teks
Huntington, Samuel P., author
Simon & Schuster, 2011
Buku Teks
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