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판 4개, 최신 판부터

ReadHowYouWant.com, Limited, 2011, ISBN 9781459626430

Berrett-Koehler Publishers, Incorporated, 2002, ISBN 9781283268561

Berrett-Koehler Publishers, Incorporated, 2002, ISBN 9781609943899

Berrett-Koehler Publishers, Incorporated, 2002, ISBN 9781605096117