Duckworth, Colin. Angels of darkness : dramatic effect in Samuel Beckett with special reference to Eugène Ionesco [Eugene Ionesco] / by Colin Duckworth. - London : George Allen & Unwin, 1972. - 153 p. : ill. ; 23 cm. Includes appendices and index. ISBN: 0048420034 : (Hbk.) Subjects--Personal Names: Beckett, Samuel, 1906-1989. Subjects--Topical Terms: English drama--Irish authors.