Stein MJ, Wallston KA, Nicassio PM. Factor structure of the Arthritis Helplessness Index. J Rheumatol. 1988 Mar;15(3):427-32
Naidoo P, Pretorius TB. The Moderating Role of Helplessness in Rheumatoid Arthritis, a Chronic Disease. Soc Behav Pers 2006;34(2):103-112.
Lindrotha Y, Strömbecka B, Brossnerb M, Gullbergc B, Wollheimd FA. Learned Helplessness and its Correlation to Impairment Pain, Anxiety and Depression in Rheumatoid Arthritis. Scand J Rheumatol 1994;23(6): 299-304
http://www.ncbi.nlm.nih.gov/pubmed/7801053