International Journal of Aging and Human Development (Vol. 73, No. 4, 2011).
baywood.metapress.com/openurl.asp?genre=issue&issn=0091-4150&volume=73&issue=4
Journal of the American Geriatrics Society (Vol. 60, No. 2, February 2012).
onlinelibrary.wiley.com/doi/10.1111/jgs.2012.60.issue-2/issuetoc
