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판 5개, 최신 판부터
Star Bright Books, Incorporated, 2008, ISBN 9781595723185
Star Bright Books, 2008, ISBN 9781595721242
Oxford University Press, USA, 1987, ISBN 9780192721495
Oxford University Press, 1985, ISBN 9780590758147
Oxford University Press, 1980, ISBN 9780192797414