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판 18개, 최신 판부터
Independently Published, 2020, ISBN 9798625556545
Independently Published, 2020, ISBN 9798639712913
Independently published, 2019, 무선(페이퍼백), ISBN 9781089430681
CreateSpace, 2013, ISBN 9781461039211
CreateSpace Independent Publishing Platform, 2012, 무선(페이퍼백), ISBN 9781478397168
BiblioBazaar, 2007, 무선(페이퍼백), ISBN 9781434636256
IndyPublish, 2007, 무선(페이퍼백), ISBN 9781435301924
IndyPublish.com, 2006, 무선(페이퍼백), ISBN 9781421933160
Hard Press, 2006, 무선(페이퍼백), ISBN 9781406927153
1st World Library, 2006, eBook, ISBN 9781595403506
IndyPublish.com, 2006, 양장(하드커버), ISBN 9781421933153
Cosimo Classics, 2006, 무선(페이퍼백), ISBN 9781596054516
1st World Library, 2005, 양장(하드커버), ISBN 9781421807508
Longman, 2001, 양장(하드커버), ISBN 9780582434448
Longman Publishing Group, 1994, 무선(페이퍼백), ISBN 9780582254107
Taylor & Francis, 1980, 양장(하드커버), ISBN 9780824045814
Longman, 1977, ISBN 9780582532717
Penguin Books, 1976, ISBN 9780140481013