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판 16개, 최신 판부터
Turtleback Books Distributed by Demco Media, 2004, Turtleback, ISBN 9780606301169
Perennial, 2003, ISBN 9780060512637
HarperCollins, 2003, ISBN 9780060535254
Tandem Library, 2003, School & Library Binding, ISBN 9781417630547
HarperCollins Publishers, 1999, 도서관 제본, ISBN 9780808563259
Perennial, 1998, ISBN 9780060929848
Canolfan Astudiaethau Addysg, 1993, ISBN 9781856441667
Scholastic Paperbacks, 1989, ISBN 9780590436908
Soundelux Audio Pub, 1985, Audio cassette, ISBN 9780881424089
Franklin Watts, 1978, School & Library Binding, ISBN 9780531003152
Avon Books, 1975, ISBN 9780380420513
Bard Books, 1975, ISBN 9780380005574
Coward-McCann, in cooperation with S. French, 1965, ISBN 9780573613494
Longman, 1964, ISBN 9780582348301
Penguin, 1962, ISBN 9780140102871
HarperCollins Publishers, 1960, 양장(하드커버), ISBN 9780060146450
