A Tale of a Tub
A Tale of a Tub was the first major work written by Jonathan Swift, arguably his most difficult satire and perhaps his most masterly. The "Tale" is a prose parody divided into sections each delving into the morals and ethics of the English. Composed between 1694 and 1697, it was eventually published in 1704. It was long regarded as a satire on religion, and has famously been attacked for that, starting with William Wotton.
A Swiftly Tilting Planet
Matthew Maddox's second novel, "The Horn of Joy" (1868), serves as a MacGuffin in "A Swiftly Tilting Planet". Charles Wallace spends a significant portion of the book trying to remember or discover what Maddox wrote in it, or to reach Maddox himself. Readers sometimes wonder whether "The Horn of Joy" ever existed; but it is a fictional book, created by L'Engle. Polly O'Keefe finds a copy of "The Horn of Joy" in her room (formerly Charles Wallace's room) when she visits her grandparents in "An Acceptable Time". Maddox's equally fictional first novel, "Once More United", is said to have been published in 1865.