The encyclopedia Americana. ”First published in 1829.” International edition. 30 volumes. Danbury, Connecticut: Grolier Incorporated, 2002. ISBN 071720135X. (englanniksi)
Clarke, Arthur C.: Greetings, carbon-based bipeds! Collected essays, 1934–1998. Edited by Ian T. Macauley. London: HarperCollins, 1999. ISBN 0-00-224697-X. (englanniksi)
Eliot, T. S.: Selected essays. New York: Faber and Faber, 1951. (englanniksi)
Scruton, Roger: The uses of pessimism and the dangers of false hope. New York: Oxford University Press, 2010. ISBN 9780199747535. (englanniksi)