請求番号:M-E:305:128
Piers Plowman and the medieval uses of enigma / by Curtis Albert Gruenler. -- UMI Dissertation Services, c1998. -- viii, 410 p. ; 23 cm.
請求番号:M-E:305:140
Justice and mercy in Piers Plowman : a reading of the B Text Visio / Myra Stokes. -- Croom Helm, c1984. -- 295 p. ; 22 cm.
請求番号:M-E:305:204
William Langland / Ralph Hanna III. -- Variorum, c1993. -- v, 52 p. ; 22 cm. -- (Authors of the Middle Ages ; 3).