Froude's John Bunyan.
Brown's John Bunyan, his Life, Times, and Works.
Macaulay's Life of Bunyan in Encylopaedia Britannica or in his Essays.
Macaulay's Essay on Southey's Edition of the Pilgrim's Progress.
Masson's The Life of John Milton, Narrated in Connection with the Political, Ecclesiastical, and Literary history of his Time (6 vols.).
Masson's Poetical Works of John Milton, 3 vols., contains excellent introductions and notes, and is the standard edition.
Raleigh's Milton.
Pattison's Milton. (E.M.L.)
Woodhull's The Epic of Paradise Lost.
Macaulay's Essay on Milton.