修兹. (2009). 数独精选100题 3: Ultimate sudoko challenge presented by Will Shortz. 北京理工大学出版社.
Chicago (17e ed.) Bronvermelding修兹. 数独精选100题 3: Ultimate Sudoko Challenge Presented by Will Shortz. 北京理工大学出版社, 2009.
MLA (8e ed.) Bronvermelding修兹. 数独精选100题 3: Ultimate Sudoko Challenge Presented by Will Shortz. 北京理工大学出版社, 2009.
Let op: Deze citaties zijn niet altijd 100% accuraat.