The Poems of the Pearl Manuscript ed. M. Andrew and R. Waldron.
R.J. Blanch ed.: Sir Gawain and Pearl: Critical Essays (1966)
W.A. Davenport: The Art of the Gawain-Poet (1978)
*Derek Brewer, ed. Companion to Gawain-Poet (1997)
A.C. Spearing: "The Alliterative Tradition: Pearl" in Medieval Dream Poetry (1976)
*A.C. Spearing: The Gawain Poet- A Critical Study (1970)
P.M. Kean: Pearl: An Interpretation
J. Conley: (ed.) The Middle English Pearl (Notre Dame, 1970)
P. Boitani: Medieval English Narrative in the thirteenth and fourteenth centuries (1984), relevant chapters.
P. Gradon: Form and Style in Early English Literature (1974)
Ad Putter, An Introduction to the Gawain-Poet, Longman (1996)

links to:
Gawain reading list
Pearl reading list
calgary pearl-poet links