1. The sociology of retirement;Atchley,1976
2. Qualitative research methods for the social sciences;Berg,1998
3. Leisure activity, life satisfaction, and perceived health status in older adults;Bevil;Gerontology and Geriatrics Education,1993
4. Head first: the biology of hope;Cousins,1989
5. Research design: qualitative and quantitative approaches;Creswell,1994