APA
Stephens P., . (2008). Sudoku Addict's Workbook. : Duncan Baird.
Chicago
Stephens Paul, . 2008. Sudoku Addict's Workbook. : Duncan Baird.
Harvard
Stephens P., . (2008). Sudoku Addict's Workbook. : Duncan Baird.
MLA
Stephens Paul, . Sudoku Addict's Workbook. : Duncan Baird. 2008.