Ashton, Rosemary. The Life of Samuel Taylor Coleridge . Cambridge, MA: Blackwell Publishers Inc., 1996.
Holmes, Richard. Coleridge: Early Visions . New York: Penguin Books, 1989.
Coleridge spent the last eighteen years of his life at Highgate, near London, England, as a patient under the care of Dr. James Gillman. There he wrote several works which were to have tremendous influence on the future course of English thought in many fields: Biographia literaria (1817), Lay Sermons (1817), Aids to Reflection (1825), and The Constitution of Church and State (1829).