Greiner, P A.(1999). Self-Rated Function, Self-Rated Health, and Postmortem Evidence of Brain Infarcts: Findings From the Nun Study. The Journals of Gerontology Series B: Psychological Sciences and Social Sciences, 54B(4), S219-S222. doi:10.1093/geronb/54b.4.s219

Greiner, P. A. "Self-Rated Function, Self-Rated Health, and Postmortem Evidence of Brain Infarcts: Findings From the Nun Study". The Journals of Gerontology Series B: Psychological Sciences and Social Sciences, 54B.4 ( 1999 ): S219-S222.