1A. C. Ward: Longman Companion to Twentieth Century Literature, 3^rded. (revised by Mauriee Hussey),Longman Group Limited, 1985.
2Authur M. Eastman, ect. : The Norton Anthology of Poetry, Shorter Edition, W. W. Norton & Company Inc., New York, 1970.
3Comprehensive Study Guide to Fourteen Poems by E. E. Cummings, by the Literary Study Guides Association, Taipei, Taiwan, 1974; Hong Kong edition by World Today Press, Hong Kong, Dec., 1977.
4J. A. Cudden: A Dictionary of Literary Terms, Revised Edition, W. & L. Mackay Limited, Chatham, Great Britain. 1979.
5Laurence Perrine: Literature: Structure, Sound and Sense, Harcourt, Brace & World, Inc., New York, 1970.
6Louis Simpson: An Introduction to Poetry, 2^rded.,St. Martin's Press, New York, 1972.
7Maurice Hussey: Poetry 1600-1660, Longman Group Limited, 1981.
8M. H. Abrams, etc. : The Norton Anthology of English Literature, 3^rd ed., W. W. Norton & Company, Inc.,New York, 1974.
9The New Encyclopaedia Britannica, 15^rd ed., 1982.
10The Poetic Works of George Herbert and Reginald Heber, Gall & Inglis, London and Edinburgh.
