修兹. (2009). 数独精选100题 4: Sudoku to boost your brainpower persented by Will Shortz. 北京理工大学出版社.
Chicago (17e ed.) Bronvermelding修兹. 数独精选100题 4: Sudoku to Boost Your Brainpower Persented 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 4: Sudoku to Boost Your Brainpower Persented by Will Shortz. 北京理工大学出版社, 2009.
Let op: Deze citaties zijn niet altijd 100% accuraat.