5Cheng ST, Chan ACM. Comparative performance of long and short forms if the geriatric depression scale in mildly de- mented Chinese. International of Journal of Geriatric Psy- chiatry, 2005, 20:1131 - 1137.
6Launeanu M, Hubley AM. Measurement invariance of the geriatric depression scale-15(GDS-15): Does gender, age, or education bias one's scores? Presented at the Annual Meeting of the National Academy of Neuropsychology, Van- couver, BC, Canada, October,2010. 13-16.
7Sheikh JI, Yesavage JA. Geriatric depression scale (GDS): Recent evidence and development of a shorter version. Clinical Gerontologist, 1986, 5:165-173.
8Mui AC. Geriatric depression scale as a community screen- ing instrument for elderly Chinese immigrants. International Psychogeriatrics, 1996, 8:445-458.
9Incalzi RA, Cesari M, Pedone C. Construct validity of the 15-item geriatric depression scale in older medical inpa- tients. Journal of Geriatric Psychiatry and Neurology, 2003, 16(1): 23-28.
10Malakouti SK, Fatollai P, Mirabzadeh A. Reliabltiy, validity and factor structure of the GDS-15 in Iranian elderly. In- ternational Journal of Geriatric Psychiatry, 2006, 21: 588- 593.