ebrary, Inc, Mangen, D. J., & Peterson, W. A. (1984). Research instruments in social gerontology. University of Minnesota Press.
Chicago-viite (17. p.)ebrary, Inc, David J. Mangen, ja Warren A. Peterson. Research Instruments in Social Gerontology. Minneapolis, MN: University of Minnesota Press, 1984.
MLA-viite (9. p.)ebrary, Inc, et al. Research Instruments in Social Gerontology. University of Minnesota Press, 1984.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.