At the round earth's imagined corners (Holy Sonnet 7)
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A depiction of the Last Judgment from one of the greatest paintings of all time: Michelangelo's Sistine Chapel. Notice the angels blowing trumpets in the middle.
A biography of Donne that focuses on the many personal transformations he underwent in his life, such as the conversion from Catholicism to Protestantism.
The 20th century poet T.S. Eliot was a champion of Donne and the other metaphysical poets. This book collects some of the lectures he gave on the subject. T.S. Eliot was just of good of a critic as poet.
A reading guide to Donne with a long biography, lots of poems, and a bibliography.
This site has an amazing collection of Donne's poetry and a brief biography.