The story of a young man's progress in the face of hypocritical antagonists set the pattern for Dickens' mature novels, while retaining elements of broad comedy which have earned more popular success than critical praise.
Nicholas Nickleby at online book stores
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Free online texts
Gutenberg: Nicholas Nickleby. EPUB, HTML, MOBI and TXT formats.
Internet Archive: The Life and Adventures of Nicholas Nickleby, Everyman's Library edition, with an introduction by G.K. Chesterton. EPUB, MOBI, PDF and TXT formats.
University of Adelaide (Internet Archive): Nicholas Nickleby. EPUB, HTML and MOBI formats.
Wikisource: Nicholas Nickleby. HTML and other formats.
Librivox: Nicholas Nickleby - Public domain audiobooks.
Orwell Foundation: Charles Dickens, by George Orwell. A valuable critical essay.
Wikipedia: Charles Dickens - Nicholas Nickleby
Further reading at Tom's Learning Notes
Bloom's Western Canon: Nicholas Nickleby is included.