APA (7th ed.) Citation

(2012). Sudoku: Over 400 challenging sudoku puzzles. Parragon.

Chicago Style (17th ed.) Citation

Sudoku: Over 400 Challenging Sudoku Puzzles. Bath: Parragon, 2012.

MLA (9th ed.) Citation

Sudoku: Over 400 Challenging Sudoku Puzzles. Parragon, 2012.

Warning: These citations may not always be 100% accurate.