Periyakoil, V. S., Kraemer, H. C., Noda, A., Moos, R., Hallenbeck, J., Webster, M., & Yesavage, J. A. (2006). The development and initial validation of the Terminally Ill Grief or Depression Scale (TIGDS). Int J Methods Psychiatr Res.

Periyakoil, Vyjeyanthi S., Helena C. Kraemer, Art Noda, Rudolf Moos, James Hallenbeck, Maria Webster, et Jerome A. Yesavage. "The Development and Initial Validation of the Terminally Ill Grief or Depression Scale (TIGDS)." Int J Methods Psychiatr Res 2006.

Periyakoil, Vyjeyanthi S., et al. "The Development and Initial Validation of the Terminally Ill Grief or Depression Scale (TIGDS)." Int J Methods Psychiatr Res 2006.