1. Family caregivers;Sherman,2019
2. Caregiving;Sherman,2016
3. Marriage and Family Encyclopedia
https://www.encyclopedia.com/history/united-states-and-canada/us-history/marriage and family
4. Family Caregiver Alliance
http://www.caregiver.org
5. Caregiving in the United States 2015
https:/www.caregiving.org/research/general caregiving