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.
Muth MK, Zhen C, Taylor J, Cates S, Kosa K, Zorn D, Choiniere C. The value to consumers of health labeling statements on breakfast foods and cereals. Journal of food products marketing. 2013 Jul;19(4):279-98. doi: 10.1080/10454446.2013.724372