Healthline. https://www.healthline.com/health-news/puzzles-can-help-maintain-brain-health
Diakses pada 15 November 2020Good Net. https://www.goodnet.org/articles/7-surprising-ways-puzzles-are-good-for-your-brain
Diakses pada 15 November 2020Men’s Health. https://www.menshealth.com/uk/health/a747918/seven-ways-to-improve-your-iq/
Diakses pada 15 November 2020Life Hack. https://www.lifehack.org/374975/science-explains-why-crossword-puzzles-are-good-for-your-mental-health
Diakses pada 15 November 2020