1. Aging: Physical and Cognitive Changes in Later Years
2. https://www.boundless.com/psychology/textbooks/boundless‐psychology‐textbook/human‐development‐14/adulthood‐74/aging‐physical‐and‐cognitive‐changes‐in‐later‐years‐291‐12826/
3. Alzheimer's Society: Cognitive Assessment Tool Kit
4. http://www.alzheimers.org.uk/cognitiveassessment
5. Brain Age Games