Rupinder Aul. (2019). A Mind Game For All - HARD Sudoku Puzzles - 2 (2019.). Manoj Publications.
Cita Chicago (17th ed.)Rupinder Aul. A Mind Game For All - HARD Sudoku Puzzles - 2. 2019. Manoj Publications, 2019.
Cita MLA (9th ed.)Rupinder Aul. A Mind Game For All - HARD Sudoku Puzzles - 2. 2019. Manoj Publications, 2019.
Atenció: Aquestes cites poden no estar 100% correctes.