DennisW.1966. Creative productivity between ages of 20 and 40 years. Journal of Gerontology21, 1–8.
2.
FerberM.1992. Music! Words! Opera! St. Louis: MMB Music.
3.
LehmanH. C.1953. Age and achievement. Princeton, NJ: Princeton University Press.
4.
LorenyenL.1991. Self-perceived creativity in the later years: Case studies of older Nebraskans. Education Gerontology, 17, 379–90.
5.
MossF.1993. “‘Adventures in bunny land’: A journey into the realm of creative opera.” (Unpublished master's thesis, Georgia State University, Atlanta).
6.
MyersD. E.1989. Aging and learning: Some implications for music education. Journal of the International Society of Music for the Handicapped, 4 (4), 3–8.
7.
RomaniukJ. G.RomaniukM.1981. Creativity across the life span: A measurement perspective. Human Development, 24, 366–81.