Rupinder Aul. (2019). A Mind Game For All - HARD Sudoku Puzzles - 2 (2019.). Manoj Publications.
芝加哥风格引文Rupinder Aul. A Mind Game For All - HARD Sudoku Puzzles - 2. 2019. Manoj Publications, 2019.
MLA引文Rupinder Aul. A Mind Game For All - HARD Sudoku Puzzles - 2. 2019. Manoj Publications, 2019.
警告：这些引文格式不一定是100％准确.