


ISBN-13: 9780739322079
Audiobook CD

ISBN-13: 9780375407178
Audiobook cassette

ISBN-13: 9780812418163
2nd editionHardcover

ISBN-13: 9780808554127
Turtleback School & Library editionHardcover

ISBN-13: 9780140180534
New editionMass-market paperback

ISBN-13: 9780394525495
30th Special Anniversary editionHardcover