The critical edition of Wordsworth's poetry is the Cornell Wordsworth, which includes an array of information on the genesis of each poem, its sources, revisions and chronology. The Cornell Wordsworth follows a prestigious line of editions of Wordsworth's work, edited by Matthew Arnold, William Knight, Ernest de Selincourt and Helen Darbishire, Duncan Wu, Jonathan Wordsworth and Stephen Gill. Readers are encouraged to remember, however, that Wordsworth was so compulsively concerned with self-revision that it is difficult, not to mention unhelpful, to label certain versions of poems ‘authoritative’. The Cornell editions are listed below for reference (all Cornell University Press), but for a more portable reading experience, readers can turn to Jared Curtis' abridged three-volume paperback/ebook The Poems of William Wordsworth: Collected Reading Texts from the Cornell Wordsworth (Humanities-Ebooks, 2009); John O. Hayden's two-volume William Wordsworth: The Poems (Penguin, 1977; repr. 1990); or Stephen Gill's William Wordsworth: The Major Works (Oxford World Classics, 2000; repr. 2008).