April 2013 ↑ "With the coming of intra-atomic energy and supersonic stratosphere aviation we face an even more staggering fourth Industrial Revolution." Harry Elmer Barnes, Historical Sociology: Its Origins and Development: Theories of Social Evolution from Cave Life to Atomic Bombing (New York, 1948), 145. ↑ "After World War II, we entered a fourth industrial revolution, with great advancement in electronics."