1. National Institute on Aging, National Institutes of Health, U.S. Department of Health and Human Services, World Health Organization Global Health and Aging. [Cited 20 April 2013.] https://d2cauhfh6h4x0p.cloudfront.net/s3fs-public/global_health_and_aging.pdf?q.52VK49USX58EJwZ3BjLl.yphsH2T_h
2. Primary health care for older people: Progress towards an integrated strategy ?;Bartlett;Health and Social Care in the Community,1999
3. Factors affecting utilization of health services and home- and community-based programs by older Taiwanese in the United States;Kuo;Research on Aging,2001
4. Statistics Indonesia 2010 National Census. Jakarta: Statistics Indonesia 2011
5. Centre for Data and Information Ministry of Health [Older people's health in Indonesia.] Buletin Jendela Data dan Informasi Kesehatan 2013 1 18