Cooke, John D., and Lionel Stevenson, English Literature of the Victorian Period, Russell & Russell, 1949.

This is a comprehensive overview of the Victorian era's politics, science, religion, and culture. It explores the era's top English poets and fiction writers, including Alfred Lord Tennyson, Matthew Arnold, Charles Dickens, George Eliot, and Carroll himself. The section on "Literature for Children" is somewhat threadbare, but overall, the book is a valuable resource.

Green, Roger Lancelyn, ed., The Diaries of Lewis Carroll, Cassell, 1953.

In 1854, Carroll began keeping a diary, which by the end of his life filled the equivalent of thirteen volumes. Nine of these thirteen volumes have been collected in Green's book, and they offer a probing look into the private life of Carroll.

Guiliano, Edward, ed., Lewis Carroll Observed, Clarkson N. Potter, Inc., 1976.

This is one of the most fascinating books about Carroll, his art, and his life...