Rupinder Aul. (2019). A Mind Game For All - HARD Sudoku Puzzles - 2 (2019.). Manoj Publications.
Lua i Stíl Chicago (17ú heag.)Rupinder Aul. A Mind Game For All - HARD Sudoku Puzzles - 2. 2019. Manoj Publications, 2019.
Lua MLA (9ú heag.)Rupinder Aul. A Mind Game For All - HARD Sudoku Puzzles - 2. 2019. Manoj Publications, 2019.
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