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판 12개, 최신 판부터
Atomic Dog Publishing, 2004, 무선(페이퍼백), ISBN 9781592601424
Prentice-Hall Canada, 2000, ISBN 9780130117953
Prentice Hall, 1997, ISBN 9780132426114
Prentice-Hall, 1997, ISBN 9780132376785
Macmillan Pub. Co., 1994, ISBN 9780023342707
Macmillan, 1993, ISBN 9780023342851
Macmillan, 1992, ISBN 9780023342509
MacMillan Pub. Co, 1990, Unknown Binding, ISBN 9780023344022
Macmillan Pub. Co., 1990, ISBN 9780023344015
Macmillan Pub. Co., 1987, ISBN 9780023344107
Macmillan, 1985, ISBN 9780023347009
Macmillan, 1982, ISBN 9780023345005