Select English Works of John Wyclif, edited from Original Mss. by Thomas Arnold. (Oxford: Clarendon Press, 1869). 3 vols. http://oll.libertyfund.org/titles/1816,
A three volume collection of Wyclife’s writings edited by Thomas Arnold in the original Middle English. Volume 1 contains sermons on the gospels; volume 2 contains gospel and epistle sermons; volume 3 contains numerous treatises, his controversial works, and letters.
The text is in the public domain.