William Hazlitt (1778-1830)

Editions: Selected Works, ed. D. Wu (9 vols, 1998); Collected Work, ed. P.P. Howe (21 vols,1930-34), the old standard edition, some texts are excluded from Wu's edition; The Letters of William Hazlitt (1978). Hazlitt's Selected Writings are available in Penguin and Oxford World's Classics paperbacks. 

Biography and criticism: Herschel Baker, William Hazlitt (1962); Stanley
Jones, Hazlitt: A Life, from Winterslow to Frith Street (1989), David
Bromwich, Hazlitt: The Mind of a Critic (1983); John Mahoney, The Logic of Passion: The Literary Criticism of William Hazlitt (1981); Robert Ready, ‘Hazlitt: In and Out of "Gusto"’, Studies in English Literature, 14 (1974), 537-46; Leonard M. Trawick, ‘Hazlitt, Reynolds, and the ideal’, Studies in Romanticism, 4 (1965), 240-7; David Stone, WH’s Theatre Criticism of Shakespeare (1977); Robert Uphaus, William Hazlitt (1985) 

site with quotes and on-line texts including 'On Familiar Style' (useful to compare with the Preface to Lyrical Ballads)