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Procrastination Equation

판 7개, 최신 판부터

HarperCollins Publishers, 2012, ISBN 9780061703621

Pearson Education, Limited, 2011, ISBN 9781283173469

Random House of Canada, 2011, ISBN 9780307357175

Harper, 2011, ISBN 9780061703614

HarperCollins Publishers, 2010, ISBN 9780062035257

HarperCollins Publishers, 2010, ISBN 9780062079695

Random House Canada, 2010, 양장(하드커버), ISBN 9780307357168