The Oxford Companion to Twentieth-Century Poetry in English The Oxford companion to twentieth-century literature in English The Oxford Companion to Twentieth-Century Art The Cambridge companion to twentieth-century opera / The Cambridge companion to twentieth-century Irish drama / The Cambridge companion to twentieth-century English poetry / The Cambridge companion to twentieth-century Russian literature / The Cambridge companion to eighteenth-century poetry / The Cambridge companion to the twentieth-century English novel / The Cambridge Companion to Twentieth-Century Irish Drama