[CITATION][C] US Census Bureau, American Community Survey Reports, ACS-29, Older Americans with a Disability: 2008–2012
W He, LJ Larsen - Washington, DC: US Government Printing Office, 2014
[CITATION][C] US Census bureau, American community survey reports, ACS-17, 90+ in the United States: 2006–2008
W He, MN Muenchrath - Washington, DC: US Government Printing Office, 2011