Books
While there are a number of translations of Sir Gawain and the Green Knight, there are also many which are simply about the famous poem and it's unknown author, usually called "the Pearl Poet" or "the Gawain Poet."
About The Poem, Analysis and History
Art and Tradition in Sir Gawain and the Green Knight by Larry D. Benson
The Folio Society Edition 2016 - Translation and commentary
The Judaic Other in Dante, the Gawain Poet, and Chaucer
Translations of the Poem from Middle English into Modern tongue
Marie Borroff 1967 Sir Gawain and the Green Knight A New Verse Translation (Norton Anthology)
Brian Stone translation Sir Gawain and the Green Knight 1959, 1974
Arthurian Legends - by Rosalind Kerven, 2011
Sir Gawain and the Green Knight - Translation by Burton Raffel
The Simon Armitage translation (includes the 1962 Everyman's Library version, too)
Sir Gawain and the Green Knight - translation by W. S. Merwin
