APA
Arcturus publishing limited, Arcturus publishing limited, . (2011). Sudoku: 200 challenging puzzles. London: Arcturus publishing limited.
Chicago
Arcturus publishing limited, Arcturus publishing limited, . 2011. Sudoku: 200 challenging puzzles. London: Arcturus publishing limited.
Harvard
Arcturus publishing limited, Arcturus publishing limited, . (2011). Sudoku: 200 challenging puzzles. London: Arcturus publishing limited.
MLA
Arcturus publishing limited, Arcturus publishing limited, . Sudoku: 200 challenging puzzles. London: Arcturus publishing limited. 2011.