William Cowper (English Wikipedia)

"Abolitionist campaigners". bl.uk. Archived from the original on 26 June 2020. Retrieved 28 April 2015.
"Great campaigners", Abolition background, UK: BL, archived from the original on 26 June 2020, retrieved 28 April 2015

books.google.com

Taylor, Thomas (1835). The Life of William Cowper, Esq. Seeley.
Cowper, William (8 April 1756). "Complaints of an Old Bachelor". Connoisseur (115).

Alumni Oxonienses 1500–1714. Vol. Abannan–Kyte. 1891. pp. 338–365. Retrieved 16 December 2010.

"James William Kelly, 'Hesketh, Harriet, Lady Hesketh (bap. 1733, d. 1807)". Oxford Dictionary of National Biography (online ed.). Oxford University Press. doi:10.1093/ref:odnb/13124. (Subscription or UK public library membership required.)
Brunstrom, Conrad (June 2006). "'Leaving the Herd': How Queer Was Cowper?" (PDF). Journal for Eighteenth-Century Studies. 29 (2): 158. doi:10.1111/j.1754-0208.2006.tb00640.x.

To be precise, Chesterton was making, in Chapter 2 of Orthodoxy [1], the point that contrary to some assumptions poetry does not make men mad, but if anything logic does. He then takes the example of Cowper: "only one great English poet went mad, Cowper. And he was definitely driven mad by logic, by the [...] logic of predestination. Poetry was not the disease, but the medicine; poetry partly kept him in health. [...] He was damned by John Calvin; he was almost saved by John Gilpin."

Cowper, William (1772). "There Is a Fountain". Hymnary.org (hymn). Retrieved 1 February 2018.
Edwin F. Hatfield

Brunstrom, Conrad (June 2006). "'Leaving the Herd': How Queer Was Cowper?" (PDF). Journal for Eighteenth-Century Studies. 29 (2): 158. doi:10.1111/j.1754-0208.2006.tb00640.x.

"James William Kelly, 'Hesketh, Harriet, Lady Hesketh (bap. 1733, d. 1807)". Oxford Dictionary of National Biography (online ed.). Oxford University Press. doi:10.1093/ref:odnb/13124. (Subscription or UK public library membership required.)

"Interactive Guide". stpetersberkhamsted.org.uk. St Peter's Great Berkhamsted. Retrieved 8 June 2020.

"Abolitionist campaigners". bl.uk. Archived from the original on 26 June 2020. Retrieved 28 April 2015.
"Great campaigners", Abolition background, UK: BL, archived from the original on 26 June 2020, retrieved 28 April 2015

"Commemorations: William Cowper". westminster-abbey.org. Westminster Abbey. Retrieved 8 June 2020.

Date of birth is given in New Style (Gregorian calendar). Old Style date is 15 November 1731. Chisholm, Hugh, ed. (1911). "Calendar" . Encyclopædia Britannica. Vol. 4 (11th ed.). Cambridge University Press.
Wikisource "The Iliad" and "The Odyssey."

Price, Martin (1973). The restoration and the eighteenth century. New York: Oxford University Press. ISBN 0-19-501614-9. OCLC 2341106.
Blackie, John Stuart (1866), Homer and the Iliad, Edinburgh: Edmonston and Douglas, p. 139, OCLC 4731357, [...] we have had great poets, like Cowper, who do not seem to have been able to distinguish between the tone of Milton and the tone of Homer.