1. Agency for Volunteer Service. (2009). Survey of NGOs and NGO Volunteers. Retrieved May 20, 2016 from http://www.avs.org.hk/symposium/pdf/AVS_BOOKlet_21.pdf
2. Agency for Volunteer Service. (n.d.). About AVS. Retrieved July 24, 2016 from http://www.avs.org.hk/en/intro
3. Census and Statistics Department. (2015). Women and Men in Hong Kong Key Statistics. Retrieved March 18, 2016 from http://www.statistics.gov.hk/pub/B11303032015AN15B0100.pdf
4. Centre of Health Protection. (2016). Vital statistics. Retrieved March 17, 2016 from http://www.chp.gov.hk/en/data/4/10/27/111.html
5. Evangelical Lutheran Church Social Service-Hong Kong. (2017a). Elderly Services. Retrieved February 20, 2017 from http://service.elchk.org.hk/eng/unit_service3.php