Blank, T. O. (1989). «Social psychology, contexts of aging, and a contextual world view». The International Journal of Aging & Human Development29 (3): 225-239. PMID2634031. doi:10.2190/WUQU-VT01-021N-GX33.
Blank, T. O. (1989). «Social psychology, contexts of aging, and a contextual world view». The International Journal of Aging & Human Development29 (3): 225-239. PMID2634031. doi:10.2190/WUQU-VT01-021N-GX33.