- complex societies and energy Tainter, Joseph A. The Collapse of Complex Societies. New Studies in Archaeology. Cambridge, Cambridgeshire ; New York: Cambridge University Press, 1988. Lord, Barry. Art & Energy. Washington, DC: The AAM Press, 2014. - energy and consumption Hagens, N.J. “Economics for the Future – Beyond the Superorganism.” Ecological Economics 169 (March 2020): 106520. https://doi.org/10.1016/j.ecolecon.2019.106520. - Energy budgets Barrett, Lisa Feldman. How Emotions Are Made: The Secret Life of the Brain, 2018. http://www.vlebooks.com/vleweb/product/openreader?id=none&isbn=9780544129962. - sleep Walker, Matthew P. Why We Sleep: Unlocking the Power of Sleep and Dreams. First Scribner hardcover edition. New York: Scribner, an imprint of Simon & Schuster, Inc, 2017. [[Chaos as a source of energy]]