Burholt, V., Windle, G., Ferring, D., Balducci, C., Fagestrom, C., Thissen, F., . . . Wenger, G. C. (2007). Reliability and validity of the Older Americans Resources and Services (OARS) social resources scale in six European countries. Journals of Gerontology B : Psychological Sciences, 62B(6), p. S371–S379.

Burholt, Vanessa, Gill Windle, Dieter Ferring, Christian Balducci, Celia Fagestrom, Frans Thissen, Germain Weber, and G Clare Wenger. "Reliability and Validity of the Older Americans Resources and Services (OARS) Social Resources Scale in Six European Countries." Journals of Gerontology B : Psychological Sciences 62B, no. 6 (2007): S371–S379.

Burholt, Vanessa, et al. "Reliability and Validity of the Older Americans Resources and Services (OARS) Social Resources Scale in Six European Countries." Journals of Gerontology B : Psychological Sciences 62B.6 (2007): S371–S379.