Hill NL, Mogle J, Bell TR, Bhargava S, Wion RK, Bhang I. Predicting current and future anxiety symptoms in cognitively intact older adults with memory complaints. Int J Geriatr Psych. 2019 Dec;34(12):1874-82. doi: 10.1002/gps.5204
Luciano JV, Barrada JR, Aguado J, Osma J, García-Campayo J. Bifactor analysis and construct validity of the HADS: a cross-sectional and longitudinal study in fibromyalgia patients. Psychological Assessment. 2014 Jun;26(2):395-406.
Mosconi M, Nelson LM, Hooper SR. Confirmatory Factor Analysis of the NEPSY for younger and older school-age children. Psychol Rep. 2008 Jun;102(3):861-6.