1. Studies Analyze Elderly Use of Television. http://www.medialit.org/reading-room/studies-analyze-elderly-use-television
2. Smyth, B., Cotter, P.: A personalized TV listings service for the digital TV age (2000)
3. US Census Bureau, An ageing world: 2015 (2016)
4. Analysis and investment strategy research report of China’s pension industry (2016)
5. Bei, G.: Analysis on the influence of residential arrangement on mental health of rural elderly (2011)